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Definition of rascality : 1. The poorer and lower classes of people.
2. The quality or state of being rascally, or a rascal; mean trickishness or dishonesty; base fraud.

Synonyms:

whimsicality, chicane, tomfoolery, guile, trickery, slick, devilry, knavery, badness, culpability, wile, worthlessness, improbity, shiftiness, waggishness, roguery, devilment, roguishness, slickness, double-dealing, slipperiness, slip, puckishness, mischief, prankishness, high jinks, naughtiness, wickedness, meanness, good, devilishness, trickiness, deviltry, ruffianism, treachery, baseness, diablerie, espièglerie, shenanigan, balefulness, crime, chicanery, maleficence, disreputability, profligacy, mischief-making, impishness, blackguardism, waggery, villainy, mischievousness, hob, dishonesty

Usage examples:

• At central Tura, where we encamped, we had evidence enough of the rascality of the Wakimbu of Tura. - "How I Found Livingstone", Sir Henry M. Stanley.
• Another six months, perhaps, when the public was tired of contemplating rascality, the editor would find something sweet, full of country charm and suburban peace, to feed them.... - "Together", Robert Herrick (1868-1938).
• Wait a moment; your rascality will do you no good, and may get you into trouble. - "A Knight Of The Nineteenth Century", E. P. Roe.