truculent (adj.) Look up truculent at Dictionary.com
1530s, from Latin truculentus "fierce, savage, stern, harsh, cruel," from trux (genitive trucis) "fierce, rough, savage, wild." Related: Truculently.
truculence (n.) Look up truculence at Dictionary.com
1727, from Latin truculentia "savageness, cruelty," from truculentus (see truculent). Related: Truculency (1560s).