Wicked or immoral according to religious or moral standards; transgressing against divine or ethical law.
From Old English synful, combining syn 'sin' (from proto-Germanic sundjo meaning 'truth, guilt') with suffix -ful. The concept evolved through Christian theology to describe moral transgression.
The word sinful carries the weight of universal moral judgment across cultures - what's fascinating is how different societies define sin, yet the concept of falling short of moral standards appears everywhere humans gather.
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