Antonyms of adj factual

1 of 2 senses of factual

Sense 1
actual, factual -- (existing in act or fact; "rocks and trees...the actual world"; "actual heroism"; "the actual things that produced the emotion you experienced")

INDIRECT (VIA real) -> unreal -- (lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria; "ghosts and other unreal entities"; "unreal propaganda serving as news")

Similarity of adj factual

2 senses of factual

Sense 1
actual, factual -- (existing in act or fact; "rocks and trees...the actual world"; "actual heroism"; "the actual things that produced the emotion you experienced")
       => real (vs. unreal), existent -- (being or occurring in fact or actuality; having verified existence; not illusory; "real objects"; "real people; not ghosts"; "a film based on real life"; "a real illness"; "real humility"; "Life is real! Life is earnest!"- Longfellow)

Sense 2
factual -- (of or relating to or characterized by facts; "factual considerations")