false (adv.)
unfaithfully, disloyally, inconstantly
KJ I.i.118[King John to Robert Faulconbridge, of the Bastard] Your father's wife did after wedlock bear him, / And if she did play false, the fault was hers
MV I.ii.41[Portia to Nerissa, of the Neapolitan prince] I am much afeard my lady his mother played false with a smith
SHAKESPEARE'S WORDS © 2020 DAVID CRYSTAL & BEN CRYSTAL