If you're looking for a word similar in meaning, you might be thinking of:
* Dismay: This word means to cause someone to feel fear, disappointment, or despair. It's a feeling of being disheartened or discouraged.
* Dim: This word means lacking in brightness or illumination. It can also be used figuratively to describe something that is not clear or distinct.
* Dismal: This word means causing or characterized by sadness, gloom, or misery.
It's helpful to provide context when asking for the definition of a word. For example, "What does 'dimay' mean in this sentence?"