1 : not breathing especially : holding one's breath. 2 archaic : not stirred by a breeze or wind : calm, still.

Is Unbreathing a word?

Unbreathing is an adjective. The adjective is the word that accompanies the noun to determine or qualify it.

Is alas a good thing?

Letting out a breathy alas in the middle of your sentence may sound dramatic or old fashioned, but it's actually an excellent way to emphasize extreme bewilderment, regret, concern, or woe.