Being lax means being careless or lazy about something. There are several synonyms to the phrase "be lax" such as neglectful, slack, remiss, careless, inattentive, indifferent, lackadaisical, nonchalant, and unconcerned. Neglectful refers to being indifferent to something that requires attention while slack refers to being slow or lazy to take action. Remiss means to be careless or neglectful in fulfilling duties or responsibilities, while careless refers to not exercising caution or carefulness. Inattentive and indifferent refer to being disinterested, while lackadaisical means lacking enthusiasm or energy. Nonchalant and unconcerned imply being insufficiently interested or emotionally detached.