IPA: /ˈpɛkəntli/
KK: /ˈpɛkəntli/
In a way that shows wrongdoing or moral fault.
He peccantly ignored the rules, leading to serious consequences.
Peccantly is derived from "peccare" (meaning to sin or to err) and the suffix "-ly" (which forms adverbs). The word describes an action or manner that is sinful or wrong, reflecting the nature of sin or error.
Think of 'peccare' meaning to sin, and remember that 'peccantly' describes something done in a sinful or erring manner.