/ Dictionary / Index B bumptious: Meaning and Definition of Find definitions for: bump•tious Pronunciation: (bump'shus), [key] — adj. offensively self-assertive: a bumptious young upstart. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bumptious (Thesaurus) bumpoff bumpy 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