disappoint

As a verb disappoint

is to displease by e.g. underperforming.

As a noun letdown is

alternative form of let-down.

Tantalize is a related term of disappoint.

As verbs the difference between tantalize and disappoint

is that tantalize is to tease (someone) by offering something desirable but keeping it out of reach while disappoint is to displease by eg underperforming or disappoint can be (internet slang).

As verbs the difference between underwhelm and disappoint

is that underwhelm is to fail to impress; to perform disappointingly while disappoint is to displease by e.g. underperforming.

As verbs the difference between disappoint and disapprove

is that disappoint is to displease by e.g. underperforming while disapprove is to condemn; consider wrong or inappropriate.

Baffle is a related term of disappoint.

As verbs the difference between baffle and disappoint

is that baffle is (obsolete) to publicly disgrace, especially of a recreant knight while disappoint is to displease by eg underperforming or disappoint can be (internet slang).

As a noun baffle

is a device used to dampen the effects of such things as sound, light, or fluid specifically, a baffle is a surface which is placed inside an open area to inhibit direct motion from one part to another, without preventing motion altogether.

As verbs the difference between disappoint and soothe

is that disappoint is to displease by eg underperforming or disappoint can be (internet slang) while soothe is (obsolete) to prove true; verify; confirm as true.

As an adjective angry

is displaying or feeling anger.

As a verb disappoint is

to displease by eg underperforming or disappoint can be (internet slang).

As a verb disappoint is

to displease by eg underperforming or disappoint can be (internet slang).

As verbs the difference between impair and disappoint

is that impair is to weaken; to affect negatively; to have a diminishing effect on while disappoint is to displease by eg underperforming or disappoint can be (internet slang).

As an adjective impair

is (obsolete) not fit or appropriate.