/ Dictionary / Index U unprincipled: Meaning and Definition of Find definitions for: un•prin•ci•pled Pronunciation: (un-prin'su-puld), [key] — adj. lacking or not based on moral scruples or principles: an unprincipled person; unprincipled behavior. not instructed in the principles of something (usually fol. by in). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unprincipled (Thesaurus) unpriced unprintable Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language