Concept:
An antonym is a word having the opposite meaning.
The word
\[
\text{Disappointment}
\]
means sadness or dissatisfaction because something expected did not happen.
Step 1: Understand disappointment.
When a person is disappointed, he loses satisfaction or expectation.
So disappointment is related to sadness, failure of expectation, and discouragement.
Step 2: Find the opposite meaning.
The opposite feeling of disappointment is expectation, confidence, or hope.
\[
\text{Disappointment} \leftrightarrow \text{Hope}
\]
Step 3: Check other options.
\[
\text{Appointment}
\]
means a fixed meeting.
\[
\text{Disturbance}
\]
means interruption.
\[
\text{Enjoyment}
\]
means pleasure, but the best antonym given in the options is hope.
Step 4: Final answer.
\[
\boxed{\text{hope}}
\]