Old English synnfull "full of sin, wicked, unholy, contrary to the laws of God;" see sin (n.) + -ful. Weakened sense of "contrary to propriety or decency" is from 1863. Related: Sinfully; sinfulness.
he said it was sinful to wear lipstick
a sinful person
sine qua non
sinecure
sinew
sinewy
sinfonia
sinful
sing
sing-along
Singapore
singe
singer
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