neglectful (adj.)

• behindhand
• careless
• delinquent
• derelict
• inadvertent
• inattentive
• laissez-faire
• lax
• loose
• negligent
• nonrestrictive
• off-guard
• permissive
• regardless
• relaxed
• remiss
• slack
• slighting
• unguarded
• unwary
• unwatchful