seething

Short definition from Wiktionary

Adjective

1. 1
   Filled with unexpressed anger; in a state of being livid.
2. 2
   In a state of extreme volatility; about to boil over; boiling, bubbling.
3. 3
   In a state of unceasing and furious activity.

Noun

1. 1
   The action of the verb to seethe.

Verb

1. 1
   present participle and gerund of seethe