nonthreatening

As adjectives the difference between nonthreatening and undefined

is that nonthreatening is not threatening; not presenting a threat while undefined is lacking a definition or value.

is likely misspelled.

has no English definition.

As an adjective nonthreatening

is not threatening; not presenting a threat.

As adjectives the difference between nonthreatening and hostile

is that nonthreatening is not threatening; not presenting a threat while hostile is belonging or appropriate to an enemy; showing the disposition of an enemy; showing ill will and malevolence, or a desire to thwart and injure; occupied by an enemy or enemies; inimical; unfriendly.

As a noun hostile is

(chiefly|in the plural) an enemy.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective nonthreatening is

not threatening; not presenting a threat.

Unthreatening is a synonym of nonthreatening.

As adjectives the difference between nonthreatening and unthreatening

is that nonthreatening is not threatening; not presenting a threat while unthreatening is not threatening.