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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.