fantastic

A fanciful or whimsical person.

Existing in or constructed from fantasy; of or relating to fantasy; fanciful.

“He told fantastic stories of dragons and goblins.”

Not believable; implausible; seemingly only possible in fantasy.

“She entered the lab and stood gaping for a good ten minutes at the fantastic machinery at work all around her.”

Resembling fantasies in irregularity, caprice, or eccentricity; irregular; grotesque.

Wonderful; marvelous; excellent; extraordinarily good or great (used especially as an intensifier).

“"I had a simply fantastic vacation, and I can't wait to tell you all about it!"”