unsmilingly
Adverb
Meaning
without smile; in an unsmiling manner
Source: WordNetSynonyms
firmly
brutally
coldly
earnestly
coolly
sternly
cruelly
soberly
seriously
severely
gravely
austerely
disapprovingly
bitterly
excruciatingly
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Antonyms
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unsmilingly, he greeted his in-laws