na-adjective
irritated-looking; seeming annoyed; antsy
Describes someone's appearance or manner as visibly irritated, agitated, or on edge. Often used with verbs like 見える, 言う, or 様子.
彼は苛立たしげにため息をついた。
He sighed in an irritated manner.
待ち合わせに遅れた友人は、苛立たしげな様子だった。
My friend, who was late for our meeting, looked irritated.
苛立たしい is the base adjective meaning 'irritating' or 'frustrating' (describing a situation or thing). 苛立たしげ adds the suffix げ to describe someone's outward appearance of being irritated.
苛立つ is a verb meaning 'to get irritated' or 'to be annoyed'. 苛立たしげ focuses on the visible signs of that irritation.
Derived from the adjective 苛立たしい (irritating) + the suffix げ (appearing, seeming). The base adjective comes from the verb 苛立つ (to be irritated).