Minacious

minacious
-adjective rare
menacing; threatening.

[ORIGIN mid 17th cent.: from Latin minax, minac- ‘threatening’ (from minari ‘threaten’ ) + -ous .]

minatory
-adjective formal
expressing or conveying a threat.

[ORIGIN mid 16th cent.: from late Latin minatorius, from minat- ‘threatened,’ from the verb minari.]