lackadaisical

lackadaisical
[ˌlakəˈdeɪzɪk(ə)l]
adjective

lacking enthusiasm and determination; carelessly lazy
松懈的；懒洋洋的
a lackadaisical defence left Spurs adrift in the second half.
松懈的防御使托特汉姆热刺队在下半场只能随波逐流。

派生
lackadaisically
adverb
语源

mid 18th cent. (also in the sense 'feebly sentimental'): from the archaic interjection lackaday, lackadaisy (see alack) + -ical