Wiktionary
unrealistically
adv. In an unrealistic manner.
WordNet
unrealistically
adv. in an unrealistic manner; "his expectations were unrealistically high" [ant: realistically]
Usage examples of "unrealistically".
Her stepfather had taken to denouncing her various interests as unrealistically ambitious or occasionally as deadeningly trivial.
Everybody's scooping up spent warheads and totally unrealistically refiring them.