Vexatious describes something that drives you crazy. The kid you're babysitting refusing to go to bed might be vexatious, for example.

Something vexatious, pronounced "veks-AY-shus," is irritating or annoying, like an itch in the middle of your back that you can't reach, or a task that you need to do for work. You can also describe something that's worrying you as vexatious, like a parent's vexatious thoughts the first time a child drives the car alone. Vexatious is also a legal term. It describes a lawsuit meant to annoy, with no hope of winning the suit.

Definitions of vexatious

adj causing irritation or annoyance

“a vexatious child”
annoying, bothersome, galling, irritating, nettlesome, pesky, pestering, pestiferous, plaguey, plaguy, teasing, vexing
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