Как по Английски будет décevant

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

adjective

Not causing someone to feel any excitement or admiration

Примеры использования:

The food was good but unfortunately we found the rest of the experience distinctly underwhelming.