hilarious

the word hilarious originates from the greek hilaros, meaning cheerful or merry, which was adopted into latin as hilaris. the english adjective was formed by appending the latin suffix -ious, meaning "full of," to the latin stem. thus, the literal sense "full of cheerfulness" evolved into its modern meaning of being extremely and boisterously funny. the semantic shift retained the core idea of exuberant mirth while specializing in the context of provoking laughter.

Structure: hilar (cheerful) + ious (adjective suffix) hilar (from latin hilaris, meaning cheerful, merry, from greek hilaros); ious (a latin-derived adjective-forming suffix meaning "full of" or "characterized by").