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English definition of “moronic”

moronic

adjective     /məˈrɒn.ɪk/ US  /mɔːˈrɑː.nɪk/ informal disapproving
very stupid : a moronic grin some really moronic suggestions Stupid and sillyOf unsound mind
(Definition of moronic adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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