Synonyms of 'fantasize'
daydreamDictionary, imagine, invent
I fantasized about writing music.
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If you daydream, you think about pleasant things for a period of time, usually about things that you would like to happen.
He daydreams of being a famous journalist.
If you hallucinate, you see things that are not really there, either because you are ill or because you have taken a drug.
Miguel stared at him, as if he were hallucinating.
If you imagine something, you think about it and your mind forms a picture or idea of it.
He could not imagine a more peaceful scene.
Thesaurus for fantasize from the Collins English Thesaurus
If you fantasize about an event or situation that you would like to happen , you give yourself pleasure by imagining that it is happening , although it is untrue or unlikely to happen.