Antonyms for chary

careful, cautious:

heedless, incautious, uncareful, rash, willing, careless, hasty.

noun:

impetuous, inattentive, inconsiderate, bold, unplanned, absentminded, forgetful, reckless, lax, imprudent, rash, brash, thoughtless, indiscreet, unmindful, inadvertent, asleep, unintentional, injudicious, venturesome, regardless.