Open English Wordnet
Adjectives
(a)infelicitousnot appropriate in application; defective“an infelicitous remark”, “infelicitous phrasing”, “the infelicitous typesetting was due to illegible copy”
(s)infelicitous, unhappymarked by or producing unhappiness“infelicitous circumstances”, “unhappy caravans, straggling afoot through swamps and canebrakes” (American Guide Series)