WordReference Random House Learner's Dictionary of American English © 2026
sin•ful /ˈsɪnfəl/USA pronunciation
adj. very bad;
seriously wrong;
shameful:a sinful waste of paper.
sin•ful•ly, adv.
WordReference Random House Unabridged Dictionary of American English © 2026- showing, guilty of, or full of sin:a sinful life.
seriously wrong;
shameful:a sinful waste of paper.
sin•ful
(sin′fəl),USA pronunciation adj.
sin′ful•ly, adv.
sin′ful•ness, n.
- characterized by, guilty of, or full of sin;
wicked:a sinful life.
- bef. 900; Middle English; Old English synfull. See sin1, -ful
sin′ful•ness, n.
- iniquitous, depraved, evil, immoral, corrupt.
'sinfully' also found in these entries (note: many are not synonyms or translations):