The Collaborative International Dictionary of English v.0.48:

Bonhomie \Bon`ho*mie"\, Bonhommie \Bon`hom*mie"\
   (b[o^]n`[o^]*m[=e]"), n. [F.]
   Good nature; pleasant and easy manner.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bonhomie
    n 1: a disposition to be friendly and approachable (easy to talk
         to) [syn: affability, affableness, amiability,
         amiableness, bonhomie, geniality]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "bonhomie":
   affability, amiability, ardency, cordiality, friendliness,
   generosity, geniality, gentleness, good disposition, good humor,
   good nature, good temper, goodnaturedness, goodtemperedness,
   graciousness, heartiness, hospitableness, hospitality, lenity,
   liberality, mildness, neighborliness, open door, openheartedness,
   receptiveness, sweetness, warmheartedness, warmness, warmth