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
  1. adjective
    causing irritation or annoyance
    “a vexatious child”
    synonyms: annoying, bothersome, galling, irritating, nettlesome, pesky, pestering, pestiferous, plaguey, plaguy, teasing, vexing
    not to your liking
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