Disappoint usually does not take a fixed preposition. By appears mainly in passive structures. In is common with disappointed, not with the verb disappoint.
Use disappoint with a direct object: The result disappointed us. In passive structures, by introduces the cause: We were disappointed by the service. Disappoint in is generally not standard as a verb pattern.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Disappoint normally takes a direct object without a preposition.
By is common after the adjective disappointed or in passive structures.
In commonly follows the adjective disappointed when referring to a person's behaviour or character.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Disappoint does not normally take in directly.
✕ The mistake disappointed in me. ✓ The mistake disappointed me.By is natural in passive or adjective patterns.
✕ The film disappointed by the audience. ✓ The film disappointed the audience.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
Not usually with the active verb. Use disappointed in after the adjective instead.
Yes. This focuses on the action or behaviour that caused disappointment.
No. The verb usually takes a direct object, as in disappoint the team.
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