IPA: /ˈvɛksər/
KK: /ˈvɛksər/
A person who causes annoyance or frustration to others.
The constant interruptions from the vexer made it hard to concentrate on the work.
Vexer is derived from the Latin word "vexare" (meaning to shake or disturb) and the suffix "-er" (meaning a person who). The word "vexer" refers to a person who disturbs or annoys others.
Think of someone who 'disturbs' ('vexare') others — that's why a vexer is a person who causes annoyance.