Synonym for reckless is "heedless"

audacious [adjective]

means "brazen"
outrageous, bold, cheeky, impertinent, impudent, reckless

careless [adjective]

means "inattentive"
reckless, forgetful, heedless, indiscreet, inaccurate, neglectful

cheeky [adjective]

means "brazen"
outrageous, bold, audacious, impertinent, impudent, reckless

desperate [adjective]

means "frantic"
headlong, rash, reckless

fast [adjective]

means "characteristic"
dissipated, dissolute, extravagant, prodigal, profligate, reckless

- translate fast

foolhardy [adjective]

means "careless"
hasty, headlong, indiscreet, precipitate, rash, reckless

frantic [adjective]

means "desperate"
headlong, rash, reckless

groundless [adjective]

means "careless"
heedless, reckless, unjustifiable, wanton, inconsiderate, wilful

hasty [adjective]

means "careless"
foolhardy, headlong, indiscreet, precipitate, rash, reckless

hotheaded [adjective]

means "fiery"
hot-tempered, peppery, excitable, rash, hasty, reckless

ill-advised [adjective]

means "brash"
foolish, inappropriate, rash, reckless, thoughtless, unwise

inattentive [adjective]

means "careless"
reckless, forgetful, heedless, indiscreet, inaccurate, neglectful

incautious [adjective]

means "rash"
hasty, reckless, thoughtless, hot-headed

indiscreet [adjective]

means "precipitate"
hasty, headlong, rash, reckless

mad [adjective]

means "behaviour"
reckless, perilous

out of control [adjective]

means "uncontrolled"
reckless, heedless, unchecked, insane, runaway, unresponsive

out of one's head [adjective]

means "crazy"
irresponsible, insane, deranged, reckless, careless

out of one's mind [adjective]

means "crazy"
irresponsible, insane, deranged, reckless, careless

over-confident [adjective]

means "arrogant"
presumptions, reckless, impudent, rash, conceited, brash

overconfident [adjective]

means "arrogant"
presumptions, reckless, impudent, rash, conceited, brash

precipitate [adjective]

means "indiscreet"
hasty, headlong, rash, reckless

prodigal [adjective]

means "profligate"
extravagant, squandering, lavish, profuse, reckless, wasteful

profligate [adjective]

means "prodigal"
extravagant, squandering, lavish, profuse, reckless, wasteful

rash [adjective]

means "heedless"
hasty, brash, impulsive, reckless, audacious, incautious

short-sighted [adjective]

means "myopic"
astigmatic, heedless, blind, unthinking, thoughtless, reckless

shortsighted [adjective]

means "improvident"
heedless, unthinking, thoughtless, reckless, unmindful, lacking foresight

slovenly [adjective]

means "inattentive"
reckless, forgetful, heedless, indiscreet, inaccurate, neglectful

thoughtless [adjective]

means "inconsiderate"
careless, inattentive, neglectful, negligent, reckless, unthinking

unchecked [adjective]

means "uncontrolled"
reckless, heedless, out of control, insane, runaway, unresponsive

unjustifiable [adjective]

means "careless"
heedless, reckless, wanton, groundless, inconsiderate, wilful

wanton [adjective]

means "careless"
heedless, reckless, unjustifiable, groundless, inconsiderate, wilful

wild [adjective]

means "quylity"
extravagant, impracticable, reckless, rash, fantastic

- translate wild

recklessly [object]

means "extravagantly"
prodigally, fast, wildly

recklessness [noun]

means "desperation"
carelessness, trouble, frenzy

fast [object]

means "characteristic"
extravagantly, prodigally, recklessly, wildly