Some hilarious, unguarded results—the likes of which we may never see from these politicians again.
The curtained-off “backstage” area is unguarded and chaotic.
People are unguarded around her, which will prove to be interesting.
1590s, "not furnished with a guard," from un- (1) "not" + guarded. Sense of "not on one's guard, not taking heed" is attested from 1630s.