temper
tem-per
verb
To moderate or soften something, or to harden metal or glass by heating.
"Temper justice with mercy."
noun
A person's usual state of mind, especially regarding their tendency to become angry.
"He has a very short temper."
Thesaurus
Synonyms: chasten, toughness, harden, snappishness, surliness, biliousness, peevishness, irritability, pettishness, humor, mood, humour