" colorlessly "

1: as in inconspicuously, unobtrusively;

•  Synonyms : 

•  inconspicuously,

•  unobtrusively,

•  unpretentiously,

•  boringly,

•  drably,

•  dully,

•  chastely,

•  demurely,

•  modestly,

•  conservatively,

•  plainly,

•  quietly,

•  simply,

•  bleakly,

•  severely,

•  somberly

•  Antonyms : 

•  bravely,

•  brightly,

•  brilliantly,

•  colorfully,

•  gaily,

•  flamboyantly,

•  flashily,

•  garishly,

•  gaudily,

•  loud,

•  loudly,

•  ostentatiously,

•  fancily,

•  ornately,

•  swankily

1: lacking an addition of color;

  * e.g., " ... since we can't decide what color to paint the doghouse, our latest home project remains colorless for the time being "

•  Synonyms : 

•  tintless,

•  uncolored,

•  undyed,

•  unpainted,

•  unstained,

•  white

•  Antonyms : 

•  colored,

•  colorized,

•  dyed,

•  hued,

•  painted,

•  pigmented,

•  stained,

•  tinct,

•  tinctured,

•  tinged,

•  tinted

2: causing weariness, restlessness, or lack of interest;

  * e.g., " ... page after page of colorless prose without even one neat turn of phrase "

•  Synonyms : 

•  arid,

•  boring,

•  drab,

•  dreary,

•  drudging,

•  dry,

•  dull,

•  dusty,

•  flat,

•  heavy,

•  ho-hum,

•  humdrum,

•  jading,

•  jejune,

•  leaden,

•  mind-numbing,

•  monochromatic,

•  monotonous,

•  numbing,

•  old,

•  pedestrian,

•  ponderous,

•  slow,

•  stale,

•  stodgy,

•  stuffy,

•  stupid,

•  tame,

•  tedious,

•  tiresome,

•  tiring,

•  uninteresting,

•  wearisome,

•  weary,

•  wearying

•  Antonyms : 

•  absorbing,

•  engaging,

•  engrossing,

•  gripping,

•  interesting,

•  intriguing,

•  involving,

•  riveting