/ Dictionary / Index R rustless: Meaning and Definition of Find definitions for: rust•less Pronunciation: (rust'lis), [key] — adj. free from rust. rustproof. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rustless (Thesaurus) rustler rust mite Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language