What does phlegmatic mean?
Phlegmatic describes a person who is calm, controlled, and slow to show strong emotion. The word is often used for someone who remains composed during danger, conflict, or inconvenience: a phlegmatic response may be interpreted as admirable self-control or as excessive detachment. Its historical associations with the four humours gave it the sense of a temperament associated with coldness and moisture, and it was once linked with slowness of mind as well as physical calm. In modern English, phlegmatic is relatively formal and occasionally humorous, particularly when applied to a person who seems unmoved by circumstances that others find exciting. It remains useful when the intended emphasis is sustained emotional control rather than enthusiasm, warmth, or energetic engagement.
adjectiveHaving a calm, unemotional disposition; showing little excitement or emotional reaction.
- Calm and unemotional, especially in response to circumstances that might provoke excitement or agitation.
"Despite the alarming news, she remained characteristically phlegmatic."
"The phlegmatic captain continued adjusting his instruments as the storm battered the ship."
"Her phlegmatic acceptance of the delay irritated the rest of the committee."
The word comes from an old humoral theory that linked personality to bodily fluids: a “phlegmatic” person was believed to have an excess of phlegm, associated with a cold, moist temperament.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does phlegmatic come from?
The word comes through Latin from Greek phlegmatikos, meaning “relating to phlegm.” Its Greek root phlegma referred to bodily fluid, especially mucus, and was connected with the ancient humoral theory of temperament. In that system, a phlegmatic person was associated with an abundance of phlegm and a cold, moist nature. Modern usage retains the sense of calmness and emotional restraint while leaving most of the medical and humoral theory behind.
Related word forms
How phlegmatic is actually used
The term is formal and literary, although it is also used humorously. It can suggest admirable emotional stability, but may carry the implication of being unusually slow to react or insufficiently engaged.