seether

[ see-ther ]

noun

1. a person who is in an agitated state, especially one who is internally agitated:

   She isn't one to blow up with a temper; she's more of a seether, keeping her negative emotions pent up.

2. Obsolete. a pot or kettle used to boil something.

Word History and Origins

Origin of seether¹

seethe ( def ) + -er ¹( def )