| Fust 1. (n.) A strong, musty smell; mustiness. 2. (v. i.) To become moldy; to smell ill. Thesaurus Entries age, antiquate, become extinct, become obsolete, date, fade, fossilize, grow old, hang fire, idle, lose currency, molder, obsolesce, outdate, perish, rust, sleep, slumber, smolder, stagnate, superannuate, vegetate |