" unyielding "

1: showing no signs of slackening or yielding in one's purpose;

  * e.g., " ... the pioneers faced the challenge of settling the frontier with unyielding courage "

•  Synonyms : 

•  determined,

•  dogged,

•  grim,

•  implacable,

•  relentless,

•  unappeasable,

•  unflinching,

•  unrelenting

•  Antonyms : 

•  flabby,

•  soft,

•  spongy,

•  squashy,

•  squishy

2: having a consistency that does not easily yield to pressure;

  * e.g., " ... knead the dough until it feels reasonably unyielding "

•  Synonyms : 

•  compact,

•  firm,

•  hard,

•  rigid,

•  solid,

•  stiff

•  Antonyms : 

•  flexible,

•  floppy,

•  pliable,

•  pliant,

•  supple,

•  yielding

3: incapable of or highly resistant to bending;

  * e.g., " ... an unyielding steel bar "

•  Synonyms : 

•  inflexible,

•  rigid,

•  stiff,

•  stiffened

•  Antonyms : 

•  acquiescent,

•  agreeable,

•  amenable,

•  compliant,

•  complying,

•  flexible,

•  pliable,

•  pliant,

•  relenting,

•  yielding