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Douglas Harper's Etymology Dictionary
unbefriended

from un- (1) "not" + past participle of befriend (v.).

Wiktionary
unbefriended

a. Not befriended; lacking friends.

Usage examples of "unbefriended".

Thus to die alone, unattended, Unbewept and unbefriended, On that bloody battle-plain.

I thought would happen, for it stands to reason a spanking beauty like she is, which is allowed by them as should have known better to go jauntering round the country unbefriended, is bound to find herself in the briars.

I was a poor, uneducated, unbefriended, mountain girl, raised from nothingness by him.