apetito

Bonan apetiton! is what you say before a meal, and it is one of the handful of Esperanto phrases that will get you through a congress dinner. Note the accusative: it is an abbreviated wish, mi deziras al vi bonan apetiton, and the ending survives even though the verb has gone. The same is true of Bonan tagon! and Dankon!.

The false seam is that -it- at the end. Esperanto really does have an -it- suffix - it is the passive past participle, giving farita done, skribita written - so apetito looks like it should be the participle of a verb apeti. There is no such verb. The -it- here is a Latin one, frozen inside the borrowed root apetit-, and the tell is that the word is a noun in -o rather than an adjective in -a: a genuine -it- participle would be apetita.

The related vocabulary is more useful than it looks. Apetita means appetising; malapetito is a loss of appetite. For the hunger itself Esperanto uses malsato, built from sata (full, sated) by the usual reversal - so the language has a built word for hunger and a borrowed one for appetite, and they are not interchangeable.