Intrepid, a.
Etymology: [L. intrepidus: cf. F. intrépide. See In- not, and Trepidation.]
Not trembling or shaking with fear; fearless; bold; brave; undaunted; courageous; as, an intrepid soldier; intrepid spirit.
Syn. -- Fearless; dauntless; resolute; brave; courageous; daring; valiant; heroic; doughty.
Shades of meaning
Fernald has no entry of its own for intrepid; he lists it under brave.
Where he writes about it:
The fearless and intrepid possess unshaken nerves in any place of danger. — from brave
Masculine may apply to the distinctive qualities of the male sex at any age; virile applies to the distinctive qualities of mature manhood only, as opposed not only to feminine or womanly but to childish, and is thus an emphatic word for sturdy, intrepid, etc. — from masculine