Oxford Dictionary
non-existent
non-existent ▶adjective not existing or not real or present: she pretended to tie a non-existent shoelace. DERIVATIVES non-existence noun
Oxford Thesaurus
non-existent
non-existent adjective she carefully brushed a non-existent piece of lint from her skirt: imaginary, imagined, unreal, fictional, fictitious, made up, invented, hypothetical, suppositional, fancied, fanciful; fantastic, fantasy, mythical, mythological, legendary; illusory, illusive, hallucinatory, chimerical, figmental, notional, shadowy, spectral, ghostly, insubstantial; missing, absent; rare phantasmal, phantasmic; inexistent, illusionary, unsubstantial. ANTONYMS real, actual.