hollowly
Adverb
Meaning
Insincerely; deceitfully.
Source: Webster's dictionarySynonyms
holy
deep
heavily
barely
cynically
futilely
dully
pointlessly
blankly
flatly
insincerely
ineffectually
vacantly
frothily
artificially
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Antonyms
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her footsteps echoed hollowly in the empty hall
his insincere words hung hollowly between them