imaginary
Definitions
Existing only in the imagination; not real.
Relating to or consisting of the square root of a negative number.
Examples
The child spent hours playing with his imaginary friend in the backyard.
She often got lost in the imaginary worlds she created in her novels.
The line between reality and his imaginary fears began to blur.
Synonyms
fictional fanciful unreal illusory mythical visionary chimerical