1. a person who creates or indulges in fantasies; a dreamer
2. a person with extravagant or impractical ideas

Examples

• The young fantast spent hours imagining elaborate adventures.
• Critics dismissed him as a mere fantast with unrealistic plans.
• She was known as a fantast who believed in impossible dreams.
• The fantast’s wild schemes never came to fruition.
• His reputation as a fantast made investors wary of his proposals.
• The author was both a skilled writer and an incurable fantast.