" answerable "

1: being the one who must meet an obligation or suffer the consequences for failing to do so;

  * e.g., " ... you are answerable for your own conduct at all times "

•  Synonyms : 

•  accountable,

•  amenable,

•  liable,

•  responsible

•  Antonyms : 

•  irresponsible,

•  nonaccountable,

•  unaccountable

2: capable of having the reason for or cause of determined;

  * e.g., " ... they say this equation is not answerable "

•  Synonyms : 

•  explainable,

•  explicable,

•  resolvable,

•  soluble,

•  solvable

•  Antonyms : 

•  hopeless,

•  inexplicable,

•  insoluble,

•  insolvable,

•  unexplainable,

•  unresolvable,

•  unsolvable