adventuresome, audacious, bold, brave,courageous, dangerous, daredevil, enterprising,foolhardy, hazardous, headstrong, intrepid, rash,reckless, risky, temerarious, venturesome,venturous

Synonyms for the word fearless: rave, unafraid, assured, bodacious, bold, confident, courageous, daring, gallant, game, gritty, gutsy, heroic, indomitable, intrepid, sanguine, smart, sure, temerarious, unabashed, undaunted, unflinching, valiant, valorous, wise

adventuresome, adventurous, any which way, audacious, brash, breakneck, carefree, careless, daredevil, daring, desperate, devil-may-care*, fast and loose, feckless, foolhardy, harebrained, hasty, headlong, heedless, helter-skelter, hopeless, hotheaded*, ill-advised, imprudent, inattentive, incautious, inconsiderate, indiscreet, kooky, madcap, mindless, negligent, overventuresome, playing with fire, precipitate, rash, regardless, temerarious, thoughtless, uncareful, venturesome, venturous, wild

Some common suffixes with -ous at the end include "-eous," "-ious," and "-uous." These suffixes are often used to form adjectives indicating possession, connection, resemblance, or nature. Examples include "poisonous," "ambitious," and "gracious."