IPA: /əbˈtruːdə/
KK: /əbˈtruːdər/
A person who intrudes or forces themselves into a situation or conversation without invitation or welcome.
The obtruder interrupted our meeting with unnecessary comments.
Obtruder → It is formed from "ob-" (meaning against) and "trudere" (meaning to push). The word describes someone who pushes themselves into a situation or conversation against the will of others.
Think of someone who 'pushes against' ('ob-') the boundaries of a conversation or situation — that's why an obtruder is someone who intrudes.