とは思いもよらなかった

never imagined

→ と
phrase Rare #38,169
never imagined Used to express strong surprise that something happened or was true. It follows a clause or noun phrase, often meaning “I never imagined that...” or “It never occurred to me that...”.
JA: 彼が海外で働くとは思いもよらなかった。
EN: I never imagined that he would work abroad.

あの日彼女に会おうとは思いもよらなかった

I never imagined I would meet her that day.

会長個人的に私の手紙に返事くれるとは思いもよらなかった

I never imagined that the chairman would personally reply to my letter.

彼が嘘をつくなどとは思いもよらなかった

It never occurred to me that he would lie.

トムこんなに間抜けとは思いもよらなかった

I never imagined Tom could be such an idiot.