Dictionary

irritable

adjective ir·ri·ta·ble \ˈir-ə-tə-bəl\

: becoming angry or annoyed easily

Full Definition of IRRITABLE

:  capable of being irritated: as
a :  easily exasperated or excited <gets irritable when he tires>
b :  responsive to stimuli
ir·ri·ta·ble·ness noun
ir·ri·ta·bly \-blē\ adverb

Examples of IRRITABLE

  1. My father is always irritable after a nap.
  2. I came home from work feeling tired and irritable.

First Known Use of IRRITABLE

1662

irritable

adjective ir·ri·ta·ble \ˈir-ət-ə-bəl\   (Medical Dictionary)

Medical Definition of IRRITABLE

:  characterized by irritability: as a :  easily exasperated or excited b :  responsive to stimuli

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