" deceitfully "

1: as in falsely, dishonestly;

•  Synonyms : 

•  artfully,

•  cannily,

•  deceptively,

•  deviously,

•  dishonestly,

•  falsely,

•  affectedly,

•  artificially,

•  hypocritically,

•  insincerely,

•  pretentiously,

•  unnaturally,

•  archly,

•  calculatingly,

•  craftily,

•  cunningly,

•  furtively,

•  insidiously,

•  sharply,

•  shiftily,

•  slickly,

•  slyly,

•  underhand,

•  underhanded,

•  underhandedly,

•  flatteringly,

•  sycophantically,

•  unctuously

•  Antonyms : 

•  artlessly,

•  guilelessly,

•  ingenuously,

•  innocently,

•  naively,

•  naturally,

•  sincerely,

•  unaffectedly,

•  unfeignedly,

•  unpretentiously,

•  genuinely,

•  honestly,

•  simply,

•  truly,

•  freely,

•  openheartedly,

•  openly

1: marked by, based on, or done by the use of dishonest methods to acquire something of value;

  * e.g., " ... charged the store owner with such deceitful practices as inflating the list prices for items only so he could put them on sale at drastically reduced prices "

•  Synonyms : 

•  crooked,

•  defrauding,

•  dishonest,

•  double-dealing,

•  false,

•  fraudulent

•  Antonyms : 

•  aboveboard,

•  honest,

•  truthful

2: tending or having power to deceive;

  * e.g., " ... the deceitful salesman neglected to mention some important information about the used car "

•  Synonyms : 

•  beguiling,

•  deceiving,

•  deceptive,

•  deluding,

•  delusive,

•  delusory,

•  fallacious,

•  false,

•  misleading,

•  specious

•  Antonyms : 

•  aboveboard,

•  forthright,

•  nondeceptive,

•  straightforward