careless and full of omissions; slipshod with many gaps
A yojijukugo describing work or a document that is sloppy and missing important parts. Often used in formal or critical contexts.
His report is so careless and full of omissions that it cannot be trusted.
杜撰 means 'careless' or 'slipshod' on its own, while 杜撰脱漏 adds the nuance of many omissions or gaps.
脱漏 means 'omission' or 'gap', and is rarely used alone; it combines with 杜撰 to emphasize missing parts.
A yojijukugo combining 杜撰 (careless, slipshod) and 脱漏 (omission, gap). The exact historical derivation is uncertain, but it is used to describe work that is both sloppy and incomplete.