tyrannous (adj.)
cruel, pitiless, oppressive
Ham II.ii.458 [Hamlet to First Player, quoting lines about Pyrrhus] a tyrannous and a damned light
KL III.iv.144 [Gloucester to Lear, of Gonerill and Regan] their injunction be to bar my doors / And let this tyrannous night take hold upon you
R3 IV.iii.1 [Tyrrel alone, of killing the Princes] The tyrannous and bloody act is done
RJ I.i.170 [Benvolio to Romeo] Alas that love, so gentle in his view, / Should be so tyrannous and rough in proof!