決きめ手てを欠かく

expression, godan verb (-ku)

lack a decisive factor; lack conclusive evidence; lack a trump card

Used when a situation, argument, or plan is missing the crucial element that would settle it. Often appears in legal, investigative, or competitive contexts. The cross-reference 決め手に欠ける is a synonymous expression.

See also: 決め手に欠ける

• この事じ件けんは決きめ手てを欠かいているため、捜そう査さが難なん航こうしている。

  The investigation is stalled because this case lacks conclusive evidence.

• 彼かれの提てい案あんは悪わるくないが、決きめ手てを欠かくので採さい用ようは見み送おくられた。

  His proposal isn't bad, but it was shelved because it lacks a decisive factor.