Example : A barbarous crime.
Brutal beatings.
Cruel tortures.
Stalin's roughshod treatment of the kulaks.
A savage slap.
Vicious kicks.

Synonyms : barbarous, cruel, fell, roughshod, savage, vicious

Example : The brutal summer sun.
A brutal winter.

Synonyms : unrelenting

Example : Beastly desires.
A bestial nature.
Brute force.
A dull and brutish man.
Bestial treatment of prisoners.

Synonyms : beastly, bestial, brute, brutish

Example : He spoke with brutal honesty.