It sounds as if you need to purchase a good Latin-English dictionary. My great little paperback version of The New College Latin & English Dictionary cost all of $6 and is fantastic. It even contains a very good grammar section in it, too.
intelligent = intelligens, -entis (a 3rd declension adjective)
athletic = athleticus, -a, -um (a 1st & 2nd declension adjective)
funny - ridiculus, -a, -um meaning funny, laughable, ridiculous and can also be referring to a clown or a joke -- or facetus, -a, -um (both 1st & 2nd declension adjectives) meaning witty, humorous, brilliantly humorous, elegantly humorous.