n.缺乏,短缺  优,没有,缺乏

【搭配】for/through lack of由于缺乏,因为没有

lack of缺乏,匮乏,短缺:Very soon the competitive part in me was winning over

my lack of confidence.(北京高考)

【联想串记】  lacking adj.缺乏,没有,不足:She's not usually lacking in conf-idence.