" unceremonious "

1: being or characterized by direct, brief, and potentially rude speech or manner;

  * e.g., " ... my polite request was met with an unceremonious refusal "

•  Synonyms : 

•  abrupt,

•  bluff,

•  blunt,

•  brusque,

•  crusty,

•  curt,

•  downright,

•  short,

•  short-spoken,

•  snippy

•  Antonyms : 

•  circuitous,

•  mealymouthed

2: not rigidly following established form, custom, or rules;

  * e.g., " ... her unceremonious approach to her hosting duties puts party guests immediately at ease "

•  Synonyms : 

•  heterodox,

•  informal,

•  irregular,

•  unconventional,

•  unorthodox

•  Antonyms : 

•  ceremonial,

•  ceremonious,

•  conventional,

•  formal,

•  orthodox,

•  regular,

•  routine