[ ˌlakə'deɪzɪk(ə)l ]
■ adjective lacking enthusiasm and thoroughness.
Derivatives
~ly adverb
Origin
C18: from the archaic interjection lackaday , lackadaisy (see alack ) + -ical .
LACKADAISICAL
Meaning of LACKADAISICAL in English
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004