caterwaul KAT-ur-wol, intransitive verb:
1. To make a harsh cry.
2. To have a noisy argument.

noun:
A shrill, discordant sound.

Caterwaul is from Middle English caterwawen, “to cry as a cat,” either from Medieval Dutch kater, “tomcat” + Dutch wauwelen, “to tattle,” or for catawail, from cat-wail, “to wail like a cat.”

vexatious vek-SAY-shuhs adjective

1. Causing vexation or irritation.

2. A legal action instituted on insufficient grounds and brought solely to annoy the defendant.

From Middle English vexacioun, from Latin vexation, from vexatus, past participle of vexare, to vex.