The Collaborative International Dictionary of English v.0.48:

Genial \Ge*ni"al\, a. (Anat.)
   Same as Genian.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Genial \Gen"ial\, a. [L. genialis: cf. OF. genial. See
   Genius.]
   1. Contributing to, or concerned in, propagation or
      production; generative; procreative; productive. "The
      genial bed." --Milton.
      [1913 Webster]

            Creator Venus, genial power of love.  --Dryden.
      [1913 Webster]

   2. Contributing to, and sympathizing with, the enjoyment of
      life; sympathetically cheerful and cheering; jovial and
      inspiring joy or happiness; exciting pleasure and
      sympathy; enlivening; kindly; as, she was of a cheerful
      and genial disposition.
      [1913 Webster]

            So much I feel my genial spirits droop. --Milton.
      [1913 Webster]

   3. Belonging to one's genius or natural character; native;
      natural; inborn. [Obs.]
      [1913 Webster]

            Natural incapacity and genial indisposition. --Sir
                                                  T. Browne.
      [1913 Webster]

   4. Denoting or marked with genius; belonging to the higher
      nature. [R.]
      [1913 Webster]

            Men of genius have often attached the highest value
            to their less genial works.           --Hare.
      [1913 Webster]

   Genial gods (Pagan Mythol.), the powers supposed to preside
      over marriage and generation.
      [1913 Webster]

WordNet (r) 3.0 (2006):

genial
    adj 1: diffusing warmth and friendliness; "an affable smile";
           "an amiable gathering"; "cordial relations"; "a cordial
           greeting"; "a genial host" [syn: affable, amiable,
           cordial, genial]
    2: of or relating to the chin or median part of the lower jaw
       [syn: genial, mental]
    3: agreeable, conducive to comfort; "a dry climate kind to
       asthmatics"; "the genial sunshine";"hot summer pavements are
       anything but kind to the feet" [syn: kind, genial]

Moby Thesaurus II by Grady Ward, 1.0:

164 Moby Thesaurus words for "genial":
   abiogenetic, aestival, affable, agreeable, amiable, amicable,
   ardent, beaming, biogenetic, blastogenetic, blissful, blithe,
   blithesome, blood-hot, blood-warm, bonhomous, bright,
   bright and sunny, calid, cheerful, cheery, civil, clubbable,
   clubbish, clubby, communicative, companionable, companionate,
   compatible, complaisant, congenial, convivial, cordial, courteous,
   desirable, dulcet, easy, easy-natured, easygoing, elated,
   en rapport, enjoyable, epigenetic, equatorial, eumerogenetic,
   eupeptic, euphoric, exalted, exhilarated, fair, fair and pleasant,
   felicific, felicitous, fine, fit for society, flushed,
   fond of society, friendly, gametic, generative, generous, genetic,
   genital, genitive, gentle, glad, gladsome, glowing, good,
   good-humored, good-natured, good-tempered, goodly, gracious,
   grateful, gratifying, gregarious, happy, harmonious, heart-warming,
   hearty, heterogenetic, high, histogenetic, homogenetic, honeyed,
   hopeful, hospitable, in good spirits, in high spirits,
   irrepressible, isogenetic, jocund, jolly, jovial, kind, kindly,
   laughing, liberal, likable, luke, lukewarm, mellifluous, mellow,
   merogenetic, merry, metagenetic, mild, monogenetic, neighborly,
   nice, of good cheer, open, openhearted, optimistic, orthogenetic,
   pangenetic, parthenogenetic, phytogenetic, pleasant, pleasing,
   pleasurable, pleasure-giving, pleasureful, radiant, receptive,
   relaxed, rewarding, riant, room-temperature, rosy, sanguine,
   sanguineous, satisfying, smiling, sociable, social, social-minded,
   sparkling, sporogenous, subtropical, summery, sunny, sunshiny,
   sweet, sweet-tempered, temperate, tepid, thermal, thermic, toasty,
   tropical, unfrozen, urbane, warm, warm as toast, warmhearted,
   warmish, welcome, welcoming, well-disposed, well-natured, winsome,
   xenogenetic