Как по Английски будет 令人失望

noun

A person who or thing which fails to fulfil an expectation or brings about the disappointment of an aim, hope, objective, etc.

adjective

Failing to fulfil someone's hopes or expectations.

Примеры использования:

The team made a disappointing start

verb

Fail to fulfil the hopes or expectations of.

Примеры использования:

I have no wish to disappoint everyone by postponing the visit

adverb

In a manner that fails to fulfil someone's hopes or expectations.

Примеры использования:

The concert ended disappointingly