IPA: /ˈkwɔːr.əl.səm/
KK: /ˈkwɔrəlˌsəm/
Tending to argue or fight with others; often involved in disputes or disagreements.
The quarrelsome neighbors often argued over trivial matters.
Quarrelsome → It is formed from "quarrel" (from Old French *quarrel*, meaning a dispute or argument) and "-some" (meaning inclined to or characterized by). The word "quarrelsome" describes someone who is inclined to engage in disputes or arguments.
Think of someone who is 'inclined' ('-some') to have 'disputes' ('quarrel') — that's why quarrelsome means someone who tends to argue.