English word nonthreatening comes from English non-, English threatening

Detailed word origin of nonthreatening

Dictionary entry	Language	Definition
non-	English (eng)	Used in the sense of not, to negate the meaning of the word to which it is prefixed.
threatening	English (eng)	Presenting a threat; menacing; frightening. An act of threatening; a threat.
nonthreatening	English (eng)	Not threatening; not presenting a threat.

Words with the same origin as nonthreatening