exceptionally, outstandingly, unbelievably
[Cleopatra to Seleucus] O rarely base!
[Lysimachus to Helicanus, of Marina] I'd ... think me rarely wed
[Leontes to Florizel] these thy offices, / So rarely kind, are as interpreters / Of my behindhand slackness!
SHAKESPEARE'S WORDS © 2020 DAVID CRYSTAL & BEN CRYSTAL