" self-importantly "

1: as in arrogantly, haughtily;

•  Synonyms : 

•  arrogantly,

•  audaciously,

•  boldly,

•  brashly,

•  brazenly,

•  contemptuously,

•  haughtily,

•  huffily,

•  imperiously,

•  loftily,

•  pompously,

•  presumptuously,

•  pretentiously,

•  pridefully,

•  proudly,

•  scornfully,

•  superciliously,

•  swaggeringly,

•  uppishly,

•  fearlessly,

•  discourteously,

•  disdainfully,

•  disrespectfully,

•  impertinently,

•  rashly,

•  recklessly,

•  saucily,

•  bitchily,

•  impolitely,

•  impudently,

•  rudely,

•  uncivilly,

•  ungraciously

•  Antonyms : 

•  abjectly,

•  deferentially,

•  hat in hand,

•  humbly,

•  lowly,

•  meanly,

•  meekly,

•  modestly,

•  sheepishly,

•  submissively,

•  obsequiously,

•  servilely,

•  subserviently,

•  fearfully,

•  mousily,

•  timidly

1: having too high an opinion of oneself;

  * e.g., " ... a self-important businessman who believed his schedule mattered more than anyone else's "

•  Synonyms : 

•  assured,

•  biggety,

•  bigheaded,

•  complacent,

•  conceited,

•  consequential,

•  egoistic,

•  egotistic,

•  important,

•  overweening,

•  pompous,

•  prideful,

•  proud,

•  self-conceited,

•  self-opinionated,

•  self-satisfied,

•  smug,

•  stuck-up,

•  swellheaded,

•  vain,

•  vainglorious

•  Antonyms : 

•  egoless,

•  humble,

•  modest,

•  uncomplacent