Antonyms of adj enthusiastic

1 sense of enthusiastic

Sense 1
enthusiastic (vs. unenthusiastic) -- (having or showing great excitement and interest; "enthusiastic crowds filled the streets"; "an enthusiastic response"; "was enthusiastic about taking ballet lessons")

unenthusiastic (vs. enthusiastic) -- (not enthusiastic; lacking excitement or ardor; "an unenthusiastic performance by the orchestra"; "unenthusiastic applause")
        => cold -- (feeling or showing no enthusiasm; "a cold audience"; "a cold response to the new play")
        => halfhearted, half-hearted, tepid, lukewarm -- (feeling or showing little interest or enthusiasm; "a halfhearted effort"; "gave only lukewarm support to the candidate")

Similarity of adj enthusiastic

1 sense of enthusiastic

Sense 1
enthusiastic (vs. unenthusiastic) -- (having or showing great excitement and interest; "enthusiastic crowds filled the streets"; "an enthusiastic response"; "was enthusiastic about taking ballet lessons")
       => ardent, warm -- (characterized by strong enthusiasm; "ardent revolutionaries"; "warm support")
       => avid, zealous -- (marked by active interest and enthusiasm; "an avid sports fan")
       => crazy, wild, dotty, gaga -- (intensely enthusiastic about or preoccupied with; "crazy about cars and racing"; "he is potty about her")
       => evangelical, evangelistic -- (marked by ardent or zealous enthusiasm for a cause)
       => glowing -- (highly enthusiastic; "glowing praise")
       => gung ho -- (very enthusiastic and dedicated)
       => overenthusiastic -- (unduly enthusiastic)
          Also See-> passionate#1; spirited#1