unenthusiastic

adjective

1. full of or characterized by enthusiasm; ardent: He seems very enthusiastic about his role in the play.

adjective

1. lacking in enthusiasm

adjective

1. filled with or motivated by enthusiasm; fanatical; keen

adj.1805, from un- (1) “not” + enthusiastic. Related: Unenthusiastically. adj.c.1600, “pertaining to possession by a deity,” from Greek enthousiastikos “inspired,” from enthousiazein (see enthusiasm). Meaning “pertaining to irrational delusion in religion” is from 1690s. The main modern sense, in reference to feelings or persons, “intensely eager, rapturous,” is from late 18c. Related: Enthusiastically.