say it: ir-i-tuh-BIL-uh-tee
irritability is a noun meaning "an irritable petulant feeling". It carries 3 recorded senses.
an irritable petulant feeling
excessive sensitivity of an organ or body part
a disposition to exhibit uncontrolled anger
“his temper was well known to all his employees”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for irritability 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.