Answerable

1. Required to justify one's actions (to somebody); accountable, responsible.
2. (of a question) Able to be answered.
3. (archaic) Correspondent, in accordance; comparable (to).
4. (now rare) Proportionate; commensurate in amount; suitable.
5. (rare, of an argument) Capable of being answered or refuted; admitting a satisfactory answer.

unanswerable