Definition of "manly"

what God or Feend, or ſpirit of the earth,Or Monſter turned to a manly ſhape,Or of what mould or mettel he be made,What ſtar or ſtate ſoeuer gouern him,Let vs put on our meet incountering mindes, […]

c. 1587–1588, [Christopher Marlowe], Tamburlaine the Great. […] The First Part […], 2nd edition, part 1, London: […] [R. Robinson for] Richard Iones, […], published 1592; reprinted as Tamburlaine the Great (A Scolar Press Facsimile), Menston, Yorkshire, London: Scolar Press, 1973, Act II, scene vi

Let's briefly put on manly readiness.

c. 1606 (date written), William Shakespeare, “The Tragedie of Macbeth”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act II, scene iii]

Serene and manly, harden'd to sustain / The load of life.

1693, Decimus Junius Juvenalis, John Dryden, transl., “[The Satires of Decimus Junius Juvenalis.] The Fifteenth Satyr”, in The Satires of Decimus Junius Juvenalis. Translated into English Verse. […] Together with the Satires of Aulus Persius Flaccus. […], London: Printed for Jacob Tonson […]

Without a successful defense of one's city, none of the other virtues would be possible; manly courage seems to be a precondition for anything else worth achieving in life.

2001, Thomas W. Smith, Revaluing Ethics: Aristotle's Dialectical Pedagogy, page 86