What does excitable mean?
Excitable is an adjective describing someone or something that responds quickly and strongly to stimulation. Applied to people or animals, it suggests a lively, easily roused temperament: an excitable child becomes giddy at small delights, an excitable crowd surges with enthusiasm, and an excitable dog barks at every passing car. The word can carry an affectionate tone when describing pets and youngsters, but may imply volatility or lack of composure when used of adults. Beyond everyday use, excitable has important scientific senses: physiologists classify nerve and muscle fibres as 'excitable tissue' because they respond to electrical stimuli, while physicists speak of excitable atoms that can absorb energy and enter higher energy states. Derived from the Latin excitare, meaning 'to rouse' or 'to call forth', the word entered English via the verb excite. Its blend of everyday warmth and technical precision makes it useful across casual conversation, behavioural description, and scientific writing alike.
Easily excited or aroused to strong emotion, activity, or reaction.
"The excitable commentator could barely contain himself during the final minutes of the match."
When applied to people, often implies enthusiasm that tips into volatility; used affectionately of children and animals.
(Physiology) Of tissue, especially nerve or muscle: capable of generating an electrical response to a stimulus.
"Neurons are highly excitable cells that propagate action potentials along their axons."
A precise technical term in physiology and biophysics, without emotional connotation.
Your heart is literally excitable — cardiac muscle is classed as 'excitable tissue' in physiology, meaning the same word describes both a hyperactive dog and the cells that keep you alive.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of excitable
Excitable derives from the verb excite, which came into English from the Latin excitare, meaning 'to rouse, stir up, or call out', a frequentative form of exciere formed from ex- ('out') and ciere ('to summon'). The adjective formed in English by combining excite with the adjectival suffix -able, indicating capacity or tendency, appearing around the early 18th century. It shares this Latin root with cognates such as incite, recite, and solicit, all tracing back to the verb ciere.
Related word forms
How excitable is actually used
Generally neutral in tone, though when applied to people it can carry a mildly negative connotation of volatility or immaturity, especially describing children or pets affectionately. In scientific contexts (physiology, physics) it is a precise technical term with no emotional connotation.
Easily confused with excitable
Irritable means easily annoyed or impatient, whereas excitable means easily excited or worked up, often with enthusiasm rather than irritation.
Excited describes someone currently feeling excitement, while excitable describes a tendency to become excited easily.