mythical

UK: /ˈmɪθɪk^əl/ US: /ˈmɪθɪkəl/ ,(mith′i kəl)

WordReference Random House Learner's Dictionary of American English © 2025

myth•i•cal /ˈmɪθɪkəl/   adj. 

1. of or relating to a myth:
   mythical heroes.
2. untrue;
   false:
   mythical superiority of one race over another.
3. unreal;
   not existing:
   mythical salary increases that never really happen.

WordReference Random House Unabridged Dictionary of American English © 2025

myth•i•cal  (mith′i kəl), adj. 

1. Mythology pertaining to, of the nature of, or involving a myth.
2. Mythology dealt with in myth, as a prehistoric period.
3. Mythology dealing with myths, as writing.
4. Mythology existing only in myth, as a person.
5. without foundation in fact;
   imaginary;
   fictitious:
   The explanation was entirely mythical.

Also, myth′ic. 

• Greek mȳthikós of myths (see myth, -ic) + -al¹
• Late Latin mȳthicus
• 1670–80

myth′i•cal•ly, adv. 
myth′i•cal•ness, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

mythical / ˈmɪθɪk^əl/, mythic / ˈmɪθɪk/ adjective

1. of or relating to myth
2. imaginary or fictitious

ˈmythically adverb