intrepid (adj.)

• adventurous
• audacious
• bold
• brave
• chivalric
• chivalrous
• courageous
• daring
• dashing
• dauntless
• fearless
• gallant
• game
• greathearted
• hardy
• heroic
• knightly
• lionhearted
• manful
• manly
• plucky
• resolute
• soldierlike
• soldierly
• stalwart
• steadfast
• stout
• stouthearted
• unafraid
• undaunted
• valiant
• valorous
• venturesome