" uncompromising "

1: not allowing for any exceptions or loosening of standards;

  * e.g., " ... an uncompromising adherence to the rules that would do a schoolmarm proud "

•  Synonyms : 

•  brassbound,

•  cast-iron,

•  exacting,

•  hard-line,

•  inflexible,

•  rigid,

•  rigorous,

•  strict,

•  stringent

•  Antonyms : 

•  flexible,

•  lax,

•  loose,

•  relaxed,

•  slack

2: sticking to an opinion, purpose, or course of action in spite of reason, arguments, or persuasion;

  * e.g., " ... the professor is generally an uncompromising stickler for deadlines, but he will make exceptions for genuine need "

•  Synonyms : 

•  adamant,

•  adamantine,

•  bullheaded,

•  dogged,

•  hard,

•  hard-nosed,

•  hardened,

•  hardheaded,

•  headstrong,

•  immovable,

•  implacable,

•  inconvincible,

•  inflexible,

•  intransigent,

•  mulish,

•  obdurate,

•  obstinate,

•  opinionated,

•  ossified,

•  pat,

•  pertinacious,

•  perverse,

•  pigheaded,

•  self-opinionated,

•  self-willed,

•  stiff-necked,

•  stubborn,

•  unbending,

•  unrelenting,

•  unyielding,

•  willful

•  Antonyms : 

•  acquiescent,

•  agreeable,

•  amenable,

•  compliant,

•  complying,

•  flexible,

•  pliable,

•  pliant,

•  relenting,

•  yielding