Upper-Intermediate (B2)
IPA: /kənˈtɛnʃəsli/
KK: /kənˈtɛnʃəsli/
Definition
In a way that causes disagreement or controversy.
Example
The two politicians debated contentiously, each refusing to back down.
Conversation

Did you see how they debated that topic contentiously?

Yeah, it was almost uncomfortable to watch!

I can't believe how heated things got over such a simple issue.

Right? They really need to learn to discuss things without arguing so contentiously.
Synonyms & Antonyms
Synonyms
disputatiously
controversially
argumentatively
Antonyms
peacefully
harmoniously
calmly
Root Explanation
Contentiously → It is formed from "contentious" (from Latin "contentiosus", meaning quarrelsome or argumentative) and the suffix "-ly" (meaning in a manner of). The word "contentiously" means in a manner that is likely to cause disagreement or argument.
Memory Tip
Think of being 'quarrelsome' ('contentious') and how doing so is 'in a manner of' ('-ly') causing disputes.
Visually Confused Words
uncontentiously
noncontentiously
conscientiously
uncontentious
sententiously
ostentatiously
noncontentious
unconscientiously