brutal

(of persons or their actions) able or disposed to inflict pain or suffering; "a barbarous crime"; "brutal beatings"; "cruel tortures"; "Stalin's roughshod treatment of the kulaks"; "a savage slap"; "vicious kicks"

harsh; "the brutal summer sun"; "a brutal winter"

resembling a beast; showing lack of human sensibility; "beastly desires"; "a bestial nature"; "brute force"; "a dull and brutish man"; "bestial treatment of prisoners"

disagreeably direct and precise; "he spoke with brutal honesty"