felicitous (adj) - fortunate or lucky; appropriate, apt, or fitting; causing happiness [fi-lis-i-tuhs]
BREAKDOWN: FELIC- (happiness) + -ITY (state of) + -OUS (full of)
infelicitous means inappropriate, unhappy, or unfortunate
felicity is a state of great happiness, luck, or success
“Elements of the heroic exist in almost every individual: it is only the felicitous development of them all in one that is rare.” —Christian Nestell Bovee