Understand 'fantasist' suggests a person may not recognize the impracticality of their ideas or dreams. He's a fantasist for believing he'll be a famous actor overnight.
Pro Tip 2/3
Negative Connotation
'Fantasist' often implies criticism; the person’s thoughts are not taken seriously. The workers viewed him as a fantasist for his unlikely promises.
Pro Tip 3/3
Exaggeration Hint
'Fantasist' is used when someone is known for making their stories or abilities seem bigger or better than they are. Don't trust everything he says; he's known to be a fantasist.