Synonyms of the word

lunatic

• n. An insane person.
• adj. crazed, mad, insane, demented.

adventurer

• n. One who enjoys adventures.
• n. A person who seeks a fortune in new and/or dangerous enterprises.
• n. A soldier of fortune, a speculator.
• n. A person who tries to advance their social position by somewhat devious means.
• n. (video games) A player of adventure games or text adventures.

daredevil

• n. A person who engages in very risky behavior, especially one who is motivated by a craving for excitement…
• adj. Recklessly bold; adventurous.

harum-scarum

• adj. wild, careless, irresponsible.
• adv. wildly, carelessly, irresponsibly.

hothead

• n. (pejorative) One who angers easily or goes in search of arguments or fights.
• n. One who reacts quickly and without thinking carefully first.

insane

• adj. Exhibiting unsoundness or disorder of mind; not sane; mad; deranged in mind; delirious; distracted.
• adj. Used by, or appropriated to, insane persons.
• adj. Causing insanity or madness.
• adj. Characterized by insanity or the utmost folly; ridiculous; unpractical.

madcap

• adj. impulsive, hasty or reckless; capricious.
• n. An impulsive, hasty, capricious person.
• n. (obsolete) An insane person, a lunatic.

madman

• n. A male who is insane or mentally disturbed.

maniac

• n. An insane person, especially one who suffers from a mania.
• n. A fanatic, a person with an obsession.

moonstruck

• adj. (obsolete) Crazy or insane when affected by the phases of the Moon.
• adj. (by extension) Showing irrational behaviour, especially of a romantic or sentimental nature.
• adj. (obsolete) Made sick, or (like fishes) unsuitable for food, by the supposed influence of the Moon.

sufferer

• n. One who suffers.
• n. One who is afflicted.

swashbuckler

• n. A swordsman or fencer who engages in showy or extravagant sword play.
• n. A daring adventurer.
• n. A kind of period adventure story with flashy action and lighthearted tone.

venturer

• n. (archaic) One who ventures; a traveller or explorer.
• n. (business) One who undertakes a business venture.