say it: uhn-uh-KOWN-tuh-buhl
unaccountable is an adjective meaning "not to be accounted for or explained". It carries 2 recorded senses.
not to be accounted for or explained
“perceptible only as unaccountable influences that hinder progress”
“an unexplainable fear”
free from control or responsibility
Definitions, synonyms and semantic relations for unaccountable come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.