Barbarous; threatening; ferocious.
He chuckled again, and then unexpectedly became so serious he was almost truculent. – Harlequin and Columbine by Booth Tarkington
" I git you," replied the bearded man, his tone and manner changing abruptly from the truculent and threatening to the soothing. – Fibble, D. D. by Irvin Shrewsbury Cobb