IPA: /əbˈsiːkwiəsli/
KK: /əbˈsiːkwiəsli/
In a way that shows too much willingness to serve or please someone, often in a flattering or insincere manner.
He obsequiously agreed with everything the boss said, hoping to gain favor.
Obsequiously → It is formed from "obsequium" (meaning compliance or dutifulness) and the suffix "-ly" (meaning in a manner of). The word describes behaving in a manner that shows excessive willingness to serve or comply with someone else's wishes.
Think of 'compliance' ('obsequium') to remember that 'obsequiously' means behaving in a way that shows excessive willingness to serve.