Concept:Synonyms are words with similar meanings.
Explanation:“Intrepid” means fearless, bold, or brave.
“Gallant” means brave, heroic, or courageous.
“Cowardly” is the opposite meaning.
“Invisible” and “Insecure” are unrelated in meaning.
So, the closest synonym is “Gallant.”
Answer:The correct answer is Gallant.