unenthusiastically
Adverb
Meaning
without enthusiasm; showing no enthusiasm
Source: WordNetSynonyms
negatively
reluctantly
cautiously
involuntarily
indifferently
coolly
warily
dully
perforce
sky-high
disinterestedly
flatly
apathetically
blandly
grudgingly
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Antonyms
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the children opened the presents unenthusiastically