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を忘れるとは

to forget ...!

→ を
phrase Rare #34,409
to forget ...! Often expresses surprise or criticism. In 思わない, it means “that ... forget” as the thought being considered.
JA: 財布を忘れるとは、我ながら情けない。
EN: To forget my wallet—I’m disappointed in myself.

タクシーに傘を忘れるとは不注意だったね。

It was careless of you to leave your umbrella in the taxi.

そんな大切なことを忘れるとは、君はずいぶん不注意だね。

Forgetting something so important—you're really careless.

それを忘れるとは彼女の不注意でした。

It was careless of her to forget it.

バスに傘を忘れるとは彼女はそそっかしい。

She’s so careless—she left her umbrella on the bus.