The Collaborative International Dictionary of English v.0.48:

Comfortable \Com"fort*a*ble\, a. [OF. confortable.]
   1. Strong; vigorous; valiant. [Obs.] --Wyclif.
      [1913 Webster]

            Thy conceit is nearer death than thy powers. For my
            sake be comfortable; hold death a while at the arm's
            end.                                  --Shak.
      [1913 Webster]

   2. Serviceable; helpful. [Obs.]
      [1913 Webster]

            Be comfortable to my mother, your mistress, and make
            much of her.                          --Shak.
      [1913 Webster]

   3. Affording or imparting comfort or consolation; able to
      comfort; cheering; as, a comfortable hope. "Kind words and
      comfortable." --Cowper.
      [1913 Webster]

            A comfortable provision made for their subsistence.
                                                  --Dryden.
      [1913 Webster]

   4. In a condition of comfort; having comforts; not suffering
      or anxious; hence, contented; cheerful; as, to lead a
      comfortable life.
      [1913 Webster]

            My lord leans wondrously to discontent;
            His comfortable temper has forsook him:
            He is much out of health.             --Shak.
      [1913 Webster]

   5. Free, or comparatively free, from pain or distress; --
      used of a sick person. [U. S.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Comfortable \Com"fort*a*ble\, n.
   A stuffed or quilted coverlet for a bed; a comforter; a
   comfort. [U. S.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

comfortable
    adj 1: providing or experiencing physical well-being or relief
           (`comfy' is informal); "comfortable clothes";
           "comfortable suburban houses"; "made himself comfortable
           in an armchair"; "the antihistamine made her feel more
           comfortable"; "are you comfortable?"; "feeling comfy
           now?" [syn: comfortable, comfy] [ant:
           uncomfortable]
    2: free from stress or conducive to mental ease; having or
       affording peace of mind; "was settled in a comfortable job,
       one for which he was well prepared"; "the comfortable thought
       that nothing could go wrong"; "was comfortable in his
       religious beliefs"; "she's a comfortable person to be with";
       "she felt comfortable with her fiance's parents" [ant:
       uncomfortable]
    3: more than adequate; "the home team had a comfortable lead"
    4: sufficient to provide comfort; "a comfortable salary"
    5: in fortunate circumstances financially; moderately rich;
       "they were comfortable or even wealthy by some standards";
       "easy living"; "a prosperous family"; "his family is well-
       situated financially"; "well-to-do members of the community"
       [syn: comfortable, easy, prosperous, well-fixed,
       well-heeled, well-off, well-situated, well-to-do]

Moby Thesaurus II by Grady Ward, 1.0:

140 Moby Thesaurus words for "comfortable":
   abounding in riches, acceptable, accepting, adequate, affluent,
   agreeable, amiable, at ease, big-rich, carefree, charmed, cheerful,
   comfortably situated, comforter, comforting, comfy, commodious,
   competent, complacent, composed, congenial, consoling, content,
   contented, convenient, cordial, cozy, cushioned, cushiony, cushy,
   decent, delighted, disgustingly rich, easeful, easy, easygoing,
   enjoyable, enough, eupeptic, euphoric, exhilarated, fat,
   favorably impressed with, festal, flush, friendly,
   frightfully rich, glad, gladsome, grateful, gratified, gratifying,
   happy, holiday, homelike, homely, homey, homish, in clover,
   in funds, in good case, in luxury, in the money, independent,
   independently rich, independently wealthy, insouciant, intimate,
   intrigued, likeable, lived-in, loaded, luxurious, made of money,
   moneyed, of good comfort, on Easy Street, on velvet, oofy, opulent,
   peaceful, plain, pleasant, pleased, pleased as Punch, pleased with,
   pleasing, prosperous, provided for, puff, quiet, reasonable,
   reconciled, relaxed, relaxing, reposeful, resigned, restful, rich,
   rich as Croesus, rolling in money, roomy, sabbatical, sans souci,
   satisfactory, satisfied, self-satisfied, serene, simple, smug,
   snug, soft, sold on, substantial, successful, sufficing, suitable,
   taken with, thrilled, tickled, tickled pink, tickled to death,
   tranquil, uncomplaining, undisturbed, unpretending, unrepining,
   untroubled, vacational, wallowing in wealth, warm, wealthy,
   welcome, well, well provided for, well-fixed, well-heeled,
   well-off, well-to-do, without care