ETYM Latin biliosus, from bilis bile.
Ill-tempered; very unpleasant.
1. Relating to or containing bile; SYN. biliary.
2. Suffering from or suggesting a liver disorder or gastric distress; SYN. liverish, livery.

ETYM Latin excitabilis inciting: cf. French excitable.
1. Easily excited.
2. (Physiology) Capable of responding to stimuli; SYN. irritable.

ETYM Latin irritabilis: cf. French irritable. Related to Irritate.
(Pathology) Abnormally sensitive to a stimulus.

ETYM Latin nervosus sinewy, vigorous: cf. French nerveux. Related to Nerve.
1. Of or relating to the nervous system; SYN. neural.
2. Anxious, or easily frightened; Sensitive; excitable; timid; apprehensive.

Fretful; peevish; easily irritated.

1. Resembling a wasp in form; having a slender waist, like a wasp.
2. Quick to resent a trifling affront; characterized by snappishness; irritable; irascible; petulant; snappish.

In an excitable manner

In an irascible manner, irritably, peevishly

In an irritable manner.

In a petulant manner; SYN. irritably, petulantly, pettishly.

In a waspish manner; sarcastically; with irritation