" flawlessly "

1: without any flaws or errors;

  * e.g., " ... flawlessly recited the first 100 digits of pi "

•  Synonyms : 

•  faultlessly,

•  ideally,

•  immaculately,

•  impeccably,

•  pat,

•  perfectly

•  Antonyms : 

•  amiss,

•  badly,

•  defectively,

•  faultily,

•  imperfectly

1: being entirely without fault or flaw;

  * e.g., " ... a flawless performance of the piano concerto "

•  Synonyms : 

•  absolute,

•  faultless,

•  ideal,

•  immaculate,

•  impeccable,

•  indefectible,

•  irreproachable,

•  letter-perfect,

•  perfect,

•  picture-book,

•  picture-perfect,

•  seamless,

•  unblemished

•  Antonyms : 

•  amiss,

•  bad,

•  censurable,

•  defective,

•  faulty,

•  flawed,

•  imperfect,

•  reproachable