IPA: /ˈtrʌkjʊləntli/
KK: /trʌkəˌlɛntli/
In a way that shows a fierce or aggressive attitude; behaving in a hostile manner.
He spoke truculently, making it clear that he was not in the mood for discussion.
Truculently → It is formed from "truculentus" (Latin, meaning fierce or savage) and the adverbial suffix "-ly" (meaning in a manner of). The word "truculently" means in a fierce or savage manner.
Think of someone acting in a 'fierce' way ('truculentus') — that's how you remember that 'truculently' means behaving in a fierce manner.