unenthusiastic B2 US /ʌnɛnθjuːziˈæstɪk/ See IPA manual adj Freq #115756 Meanings 1 adj not enthusiastic 2 adj Without enthusiasm; unexcited. Etymology From un- + enthusiastic. Thesaurus Synonyms 2 adj · without enthusiasm; unexcited. adiaphroisticapatheticapathisticalblaséblithecooldeafdispassionatedullenervatedgallionichalfhearted