Longman Dictionary of Contemporary English homepage

unaccountable

adjective
     
un‧ac‧count‧a‧ble formal
1 very surprising and difficult to explain:
the unaccountable shyness she always felt in Louise's presence
For some unaccountable reason, he arrived a day early.
2 not having to explain your actions or decisions to anyone else [≠ accountable]
unaccountable to
Doctors still remain largely unaccountable to the public.

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