The Collaborative International Dictionary of English v.0.48:

Agreeable \A*gree"a*ble\, a. [F. agr['e]able.]
   1. Pleasing, either to the mind or senses; pleasant;
      grateful; as, agreeable manners or remarks; an agreeable
      person; fruit agreeable to the taste.
      [1913 Webster]

            A train of agreeable reveries.        --Goldsmith.
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   2. Willing; ready to agree or consent. [Colloq.]
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            These Frenchmen give unto the said captain of Calais
            a great sum of money, so that he will be but content
            and agreeable that they may enter into the said
            town.                                 --Latimer.
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   3. Agreeing or suitable; conformable; correspondent;
      concordant; adapted; -- followed by to, rarely by with.
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            That which is agreeable to the nature of one thing,
            is many times contrary to the nature of another.
                                                  --L'Estrange.
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   4. In pursuance, conformity, or accordance; -- in this sense
      used adverbially for agreeably; as, agreeable to the order
      of the day, the House took up the report.
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   Syn: Pleasing; pleasant; welcome; charming; acceptable;
        amiable. See Pleasant.
        [1913 Webster]

WordNet (r) 3.0 (2006):

agreeable
    adj 1: conforming to your own liking or feelings or nature; "Is
           the plan agreeable to you?"; "he's an agreeable fellow";
           "My idea of an agreeable person...is a person who agrees
           with me"- Disraeli; "an agreeable manner" [ant:
           disagreeable]
    2: in keeping; "salaries agreeable with current trends"; "plans
       conformable with your wishes"; "expressed views concordant
       with his background" [syn: accordant, agreeable,
       conformable, consonant, concordant]
    3: prepared to agree or consent; "agreeable to the plan"

Moby Thesaurus II by Grady Ward, 1.0:

350 Moby Thesaurus words for "agreeable":
   Junoesque, OK, abject, acceptable, accepting, accommodating,
   accommodative, accordant, achingly sweet, acquiescent, admissible,
   adorable, affable, affirmative, agreeable, agreeable-sounding,
   agreeing, akin, alacritous, all right, alright, ambrosial,
   amenable, amiable, amicable, amply endowed, answerable, appealing,
   appetizing, approving, ardent, ariose, arioso, assenting, at one,
   attentive, attractive, attuned, becoming, benevolent, benign,
   benignant, blissful, bonhomous, bonny, braw, brotherly, built,
   built for comfort, buxom, callipygian, callipygous, canorous,
   cantabile, catchy, cheerful, civil, coexistent, coexisting,
   coherent, coincident, coinciding, comely, commensurate, compatible,
   complaisant, compliable, compliant, complying, concordant,
   concurring, conformable, congenial, congruent, congruous,
   consentaneous, consentient, consenting, considerate, consistent,
   consonant, content, cooperating, cooperative, cordial,
   correspondent, corresponding, courteous, curvaceous, curvy, dainty,
   decent, deferential, delectable, delicate, delicious, delightful,
   desirable, disposed, docile, dulcet, eager, easy, easy-natured,
   empathetic, empathic, en rapport, endorsing, enjoyable,
   enthusiastic, enviable, equivalent, euphonic, euphonious,
   euphonous, exciting, exquisite, fain, fair, fair and pleasant,
   favorable, favorably disposed, favorably inclined, felicific,
   felicitous, fine, fine-toned, forward, fraternal, frictionless,
   friendlike, friendly, game, generous, genial, gentle, goddess-like,
   golden, golden-tongued, golden-voiced, good, good enough,
   good to eat, good-humored, good-looking, good-natured,
   good-tasting, good-tempered, goodly, graceful, gracious, grateful,
   gratifying, gustable, gusty, harmonious, heart-warming, heedful,
   helpful, honeyed, in accord, in agreement, in concert, in favor,
   in rapport, in sync, in synchronization, in the mind, in the mood,
   in tune, inaccordance, inclined, indulgent, inharmony, juicy, kind,
   kindly, lenient, likable, like-minded, likely, lovable,
   lovely to behold, luscious, lush, melic, mellifluent, mellifluous,
   mellisonant, mellow, melodic, melodious, mild, minded, mindful,
   mindful of others, mouth-watering, music-flowing, music-like,
   musical, nectareous, nectarous, neighborlike, neighborly, nice,
   nondissenting, nonresistant, nonresisting, nonresistive,
   nothing loath, obedient, obliging, of a piece, of gourmet quality,
   of like mind, of one mind, okay, on all fours, overindulgent,
   overpermissive, palatable, passable, passive, peaceable, peaceful,
   permissive, personable, pleasant, pleasant-sounding, pleasing,
   pleasurable, pleasure-giving, pleasureful, pliant, pneumatic,
   polite, positive, predisposed, presentable, prompt, prone,
   proportionate, provocative, quick, ratifying, ready,
   ready and willing, receptive, reconcilable, regardful, resigned,
   respectful, responsive, rewarding, rich, sanctioning, sapid,
   satisfactory, satisfying, savorous, savory, scrumptious, seductive,
   self-consistent, servile, shapely, sightly, silver-toned,
   silver-tongued, silver-voiced, silvery, simpatico, singable,
   sisterly, slender, sociable, solicitous, songful, songlike,
   sonorous, stacked, statuesque, submissive, subservient, succulent,
   supine, sweet, sweet-flowing, sweet-sounding, sweet-tempered,
   symbiotic, sympathetic, sympathique, synchronized, synchronous,
   tactful, taking, tantalizing, tasty, tempting, tenable, thoughtful,
   to be desired, together, tolerant, toothsome, tractable, tunable,
   tuneful, unanimous, unassertive, uncomplaining, understanding,
   unexceptionable, ungrudging, unhostile, uniform, unisonant,
   unisonous, united, unloath, unobjectionable, unrefusing,
   unreluctant, unresistant, unresisting, urbane, viable, welcome,
   well-affected, well-built, well-disposed, well-favored,
   well-formed, well-inclined, well-intentioned, well-made,
   well-meaning, well-meant, well-natured, well-proportioned,
   well-shaped, well-stacked, willed, willing, willinghearted,
   winning, worth having, yummy, zealous