IPA: /ˌoʊ.vərˈwiː.nɪŋ/
KK: /oʊvərˈwinɪŋ/
Having an excessive or arrogant attitude; showing too much pride or confidence.
His overweening ambition led him to take risks that others would avoid.
Overweening → It is formed from "over-" (meaning excessively) and "ween" (from Old English *wenian*, meaning to think or suppose) and the suffix "-ing" (indicating an action or process). The word describes an excessive or arrogant belief in one's own worth or abilities.
Think of someone who thinks too highly of themselves ('over-') and is 'thinking' ('ween') that they are better than others. This helps you remember that 'overweening' refers to excessive pride or arrogance.