felicitous vs happy

felicitous and happy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
felicitous	No	Yes	No	No
happy	No	Yes	No	No

As adjectives, felicitous and happy are synonyms defined as:

felicitous (adjective)	happy (adjective)
exhibiting an agreeably appropriate manner or style	enjoying or showing or marked by joy or pleasure
marked by good fortune	well expressed and to the point
	marked by good fortune
	eagerly disposed to act or to be of service