undemonstrative
Adjective
Meaning
not given to open expression of emotion
Source: WordNetSynonyms
stoic
bashful
phlegmatic
controlled
cold
remote
distant
cool
reserved
passive
modest
quiet
withdrawn
calm
constrained
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Antonyms
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The first half of the 1960s was the apogee of what might be termed the Age of Cool - as defined by that quality of being simultaneously with-it and disengaged, in control but nonchalant, knowing but ironically self-aware, and above all inscrutably undemonstrative.
True bravery is quiet, undemonstrative.