Now, sobriety does not mean unsmilingness. A man can be just as sober when he smiles as when he does not.
Wikipedia foundation.
unsmiling — adjective not smiling; serious or unfriendly. Derivatives unsmilingly adverb unsmilingness noun … English new terms dictionary
unsmiling — adj. not smiling. Derivatives: unsmilingly adv. unsmilingness n … Useful english dictionary