defective
adjective uk/dɪˈfek.tɪv/ us/dɪˈfek.tɪv/
C2 有缺陷的，有毛病的，有问题的
Something that is defective has a fault in it and does not work correctly.
defective brakes 有问题的制动装置
defective eyesight 有缺陷的视力
a defective gene 缺损的基因
I think that theory is defective. 我认为那种理论有缺陷。