Wiktionary
maskless
a. Without a mask.
Usage examples of "maskless".
I thought with pleasure of the steam in which, maskless, I would wallow while she stared at me with her calm, appraising eyes.
Why, for that matter, were Dannerman and Hilda and the two Pats allowed to enter in their inevitably germ-laden clothes, exhaling their germ-laden breaths, maskless, into the pure air of the operating room?