Definition of lackadaisical adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌlækəˈdeɪzɪkl//
; NAmE NAmE//ˌlækəˈdeɪzɪkl//
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not showing enough care or enthusiasm He has a lackadaisical approach to finding a job. Word Origin mid 18th cent. (also in the sense ‘feebly sentimental’): from lackaday (or its obsolete extended form lackadaisy).
See the Oxford Advanced American Dictionary entry: lackadaisical