unsmiling
adjective
un·smil·ing
ˌən-ˈsmī-liŋ
: not smiling or tending to smile : marked by a somber or serious expression or attitude
a stern, unsmiling teacher
unsmilingly
adverb
His views were unsmilingly stated, implacably held, and amenable to no reasonable argument.
—Simon Winchester
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Merriam-Webster unabridged
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