Both Uses

stoic
in
Epistle II of An Essay On Man
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Placed on this isthmus of a middle state,
A being darkly wise, and rudely great:
With too much knowledge for the sceptic side,
With too much weakness for the stoic's pride,
He hangs between;†
In lazy apathy let stoics boast
Their virtue fixed; 'tis fixed as in a frost;
Contracted all, retiring to the breast;
But strength of mind is exercise, not rest:
The rising tempest puts in act the soul,
Parts it may ravage, but preserves the whole.†
*

Stoics = people who try to be unaffected by pleasure, pain, or emotions

Definitions:

(1) (stoic)
seeming unaffected by pleasure, pain, or emotions
(2) (meaning too rare to warrant focus)
More rarely, a stoic can refer to a member of the ancient Greek school of philosophy founded by Zeno (known for striving to be unaffected by pleasure, pain, or emotions).