1. Produced or existing only in the imagination or fancy; not real; having the nature of a phantom; apparent only; whimsical; capricious; odd; groteaque.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• fantasticaly,
• fantastick,
• fantasical,
• fanatastical,
• fantasticc,
• fantasticlly,
• fantasticly,
• fantatical,
• fantstical,
• fanactical,
• fantastics,
• fantaastical,
• fantastcal,
• fantastacal,
• Anapastical,
• fantasticizm,
• Fantasticko,
• phantasitcal,
• Faddistical,
• Fanstastical

• fanatically,
• fantastically,
• fantasize,
• fantasia,
• fantasise,
• fantasy life,
• fantastic,
• fanatical,
• fantasist.

The adjective form of "fantastical" is "fantastical".

The plural form of the word "fantastical" is "fantasticals".

The singular form of the word "fantastical" is "fantastical". The word does not change when used in the singular form.