Meaning of “rotten” in the English Dictionary

"rotten" in British English

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rottenadjective

uk /ˈrɒt.ən/ us /ˈrɑː.tən/

B2 decayed:

The room smelled of rotten vegetables.

very bad:

rotten weather
old-fashioned It was rotten of you to leave without saying goodbye.

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(Definition of “rotten” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"rotten" in American English

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rottenadjective

us /ˈrɑt·ən/

See at rot.

Rotten also means bad:

a rotten trick
rotten behavior

(Definition of “rotten” from the Cambridge Academic Content Dictionary © Cambridge University Press)