rascal

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that is playfully mischievous.
• noun An unscrupulous, dishonest person; a scoundrel.
• adjective Made up of, belonging to, or relating to the lower classes.

from The Century Dictionary.

• noun The commonalty of people; the vulgar herd; the general mass.
• noun In hunting, a refuse or despicable beast or class of beasts; an animal, or animals collectively, unfit to chase or to kill, on account of ignoble quality or lean condition; especially, a lean deer.
• noun A low or vulgar person; one of the rabble; a boor or churl.
• noun A low or mean fellow; a tricky, dishonest person; a rogue; a knave; a scamp: used in objurgation with much latitude, and often, like rogue, with slight meaning. Compare rascally.
• Paltry; worthless; unworthy of consideration; in a special use, unfit for the chase, as a lean deer: used of things or animals.
• Low; mean; base; common; ignoble; vulgar; knavish: used of persons, formerly with reference to class or occupation, but now only with an implication of moral baseness or dishonesty.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Of or pertaining to the common herd or common people; low; mean; base.
• noun obsolete One of the rabble; a low, common sort of person or creature; collectively, the rabble; the common herd; also, a lean, ill-conditioned beast, esp. a deer.
• noun A mean, trickish fellow; a base, dishonest person; a rogue; a scoundrel; a trickster.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Someone who is naughty; either playfully mischievous or a troublemaker, a dishonest person, a scoundrel.
• noun A member of a criminal gang in Papua New Guinea.
• adjective archaic low(ly), part of or belonging to the common rabble

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun one who is playfully mischievous
• noun a deceitful and unreliable scoundrel