FreeVocabulary
Overweening
/ˌoʊ.vərˈwiː.nɪŋ/ adjective hardSomeone overweening displays such inflated pride or ambition that they disregard reasonable limits.
His overweening confidence led him to skip the safety review entirely, certain that nothing could go wrong.
Memory Trick
Combine 'over' with 'ween,' an old word for believe - overweening literally means thinking way too highly of yourself.