phlegmatic

adj. slow, sluggish; passive, indifferent, apathetic

Four Temperaments is a theory of psychology that stems from the ancient concept of four humors (humorism). It is considered obsolete by many contemporary professionals.It is also the name of a 1946 ballet choreographed by George Balanchine for his company Ballet Society (now New York City Ballet).
See more at Wikipedia.org...

Adjective
1. showing little emotion; "a phlegmatic...and certainly undemonstrative man"
(synonym) phlegmatical
(similar) unemotional

(a.)
Watery.
  

(a.)
Not easily excited to action or passion; cold; dull; sluggish; heavy; as, a phlegmatic person.
  

(a.)
Generating or causing phlegm.
  

(a.)
Abounding in phlegm; as, phlegmatic humors; a phlegmatic constitution.
  

adj.
1. abounding in phlegm
بلغمي
2. generating phlegm
بلغم پيدا کرنے والا
3. cold
سرد, , سست, ميٹھا