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unaccountable

[uhn-uh-koun-tuh-buh l] /ˌʌn əˈkaʊn tə bəl/
adjective
1.
impossible to account for; unexplained; inexplicable:
The boat has an unaccountable tendency to yaw.
2.
exempt from being called to account; not answerable:
As a subordinate, he is unaccountable for errors in policy.
Origin
1635-1645
1635-45; un-1 + accountable
Related forms
unaccountableness, unaccountability, noun
unaccountably, adverb
Synonyms
1. incomprehensible, inscrutable, mysterious, unintelligible. 2. unanswerable, irresponsible.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un accountable

unaccountable

/ˌʌnəˈkaʊntəbəl/
adjective
1.
allowing of no explanation; inexplicable
2.
puzzling; extraordinary: an unaccountable fear of hamburgers
3.
not accountable or answerable to
Derived Forms
unaccountableness, unaccountability, noun
unaccountably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for un accountable

unaccountable

adj.

1640s, "inexplicable," from un- (1) "not" + accountable. Meaning "not liable to be called to account" is recorded from 1640s. Related: Unaccountably.

Online Etymology Dictionary, © 2010 Douglas Harper
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