Duke Robert was threatening; "he shall know what it is to play false with the heir of William the Norman!"
Then said Juno all crafty and full of guile, 'You will play false, and will not hold to your word.
Turning swiftly, he snarled and bit, at them in angry disbelief that his good little legs should play false with his stout heart.
For the sake of effect, I shall not play false with philosophy.
Well, then, would it be bad to play false with an escaped felon—to double-cross him?
It was not my habit to cheat and play false; here above all places, when promises would have been made, how was I to break them?
Did I play false with you when I saved you from the spits of the Minimuls?
As Lady Macbeth says of her husband, they "would not play false, and yet would wrongly win."
All of a sudden a rumour was spread abroad that the woman was about to play false, and to peach the rest.
The dealer can play false cards; while the adversaries cannot afford to deceive each other.
late 12c., from Old French fals, faus (12c., Modern French faux) "false, fake, incorrect, mistaken, treacherous, deceitful," from Latin falsus "deceived, erroneous, mistaken," past participle of fallere "deceive, disappoint," of uncertain origin (see fail).
Adopted into other Germanic languages (cf. German falsch, Dutch valsch, Danish falsk), though English is the only one in which the active sense of "deceitful" (a secondary sense in Latin) has predominated. False alarm recorded from 1570s. Related: Falsely; falseness.