How to Use "unaccountable" with Example Sentences

1. An insane person is unaccountable for his actions .
2. I 'm unaccountable to tell you about this .
3. Spain 's democracy has given too much unaccountable power to the two main parties .
4. For some unaccountable reason , the letter never arrived .
5. Before modern linguistics , the meaning of a word was assumed to be unaccountable .