seething describes anger you can barely contain if you are seething and something sets you off you just might explode into a rage someone who s seething with anger is furious but keeping it a secret maybe someone insulted you in front of others and you want to let it go on the inside though you might be seething or during the big game an opponent s harsh words can have you seething but you want to stay focused on scoring points seething sometimes describes something that s boiling over like a seething pot of soup and this is also the root of the word