For years, young voters in America have been unenthusiastic about, if not outright hostile toward, the GOP.
The Israeli official response to Barak's trial balloon was unenthusiastic.
Behind the scenes, Schwarzenegger was an unenthusiastic endorser of Bush in 2004.
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.