On the contrary, The Philosopher (Ethic. iii) reckons fearlessness to be opposed to fortitude.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic fearlessness contrary
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/18755/pg18755-images.html

Context

“3: Further, vices are opposed to virtue and extremes to the mean. But one mean has only one extreme on the one side. Since then fortitude has fear opposed to it on the one side and daring on the other, it seems that fearlessness is not opposed thereto.
On the contrary, The Philosopher (Ethic. iii) reckons fearlessness to be opposed to fortitude. I answer that, As stated above (Q. 123, A. 3) , fortitude is concerned about fear and daring. Now every moral virtue observes the rational mean in the matter about which it is concerned. Hence it belongs to fortitude that man should moderate his fear according to reason, namely that he should fear what he ought, and when he ought, and so forth.” source