felicitous \fuh-LIS-uh-tuhs\ (adjective) - 1 : Suitably applied or expressed; appropriate; apt. 2 : Happy; delightful; marked by good fortune.

"His end fell well on the feast of Felix, for he was felicitous in all things ; felicitous in endowing the church, felicitous in ordering more clearly the divine offices, felicitous in the administration of justice, and, in fine, felicitous in all his life." -- John Capgrave, 'The Book of the Illustrious Henries'

Felicitous is derived from Latin felicitas, "fertility, hence success, happiness," from felix, "fertile, successful, happy."