/ Dictionary / Index A assiduous: Meaning and Definition of Find definitions for: as•sid•u•ous Pronunciation: (u-sij'-us), [key] — adj. constant; unremitting: assiduous reading. constant in application or effort; working diligently at a task; persevering; industrious; attentive: an assiduous student. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: assiduous (Thesaurus) assiduity assign Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language