careless, slipshod, sloppy;〔欠点のある〕faulty
- この研究所では薬物の管理がずさんだ
- They are very careless about the way they keep chemicals in this laboratory.
- この計画はずさんだ
- This plan is faulty [《口》 full of holes].
- 彼はやることがずさんだ
- He does things sloppily [in a slipshod manner]./《米口》 He does things any old way.