/ Dictionary / Index S sunfast: Meaning and Definition of Find definitions for: sun•fast Pronunciation: (sun'fast", -fäst"), [key] — adj. not subject to fading in sunlight, as a dye, fabric, or garment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sundsvall sunfish Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language