決心がつかない

can't make up one's mind

→ 決心
phrase Rare #39,327
can't make up one's mind Used when someone is unable to reach a decision. The positive form, 決心がつく, means “make up one's mind.”
JA: どちらの車を買うか、まだ決心がつかない。
EN: I still can't make up my mind which car to buy.

行くべきかどうか、決心がつかない。

I can’t decide whether I should go.

どうしても決心がつかないんだ。

I just can't make up my mind.

彼女は結婚しようと思うが決心がつかない。

She is considering getting married, but can't make up her mind.