" unappeasable "

1: incapable of being satisfied;

  * e.g., " ... it turned out that the public's appetite for sadistic horror movies was not unappeasable after all "

•  Synonyms : 

•  inappeasable,

•  inextinguishable,

•  insatiable,

•  insatiate,

•  quenchless,

•  unquenchable,

•  unslakable

•  Antonyms : 

•  appeasable,

•  extinguishable,

•  satiable,

•  satisfiable

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

  * e.g., " ... warned that the nation was dealing with an unappeasable enemy "

•  Synonyms : 

•  determined,

•  dogged,

•  grim,

•  implacable,

•  relentless,

•  unflinching,

•  unrelenting,

•  unyielding

•  Antonyms : 

• (N/A)