didn't think of, couldn't think of
彼女が病気で入院しているということに思いつかなかった。
It never occurred to me that she was in the hospital because she was sick.
私は何も言うことを思いつかなかった。
I couldn't think of anything to say.
何で思いつかなかった？
Why didn’t I think of that?
— パラサイト 半地下の家族 (2019)
思いつかなかった
I couldn't think of anything.
— Hoje Eu Quero Voltar Sozinho (2014)