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Unenthused (adjective)
Not enthused.
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Unenthusiastic (adjective)
Without enthusiasm; unexcited.
Wiktionary
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Unenthused (adjective)
not interested or appreciative; unenthusiastic
“they are pretty unenthused about the idea”
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Unenthusiastic (adjective)
not having or showing enthusiasm
“an unenthusiastic response”
Oxford Dictionary