Short term NEGLIGENCE always leads to long term FRUSTRATION

Negligence: carelessness, default, dereliction, disregard, failure, forgetfulness, heedlessness, inadvertence, inattention, inattentiveness, indifference, laxity, laxness, neglect, omission, oversight, remissness, shortcoming, slackness, thoughtlessness 

Frustration: annoyance, bitter pill, blocking, blow, bummer, chagrin, circumvention, contravention, curbing, defeat, disgruntlement, dissatisfaction, downer, drag, failure, fizzle, foiling, grievance, hindrance, impediment, irritation, letdown, nonfulfillment, nonsuccess, obstruction, old one-two, resentment, setback, unfulfillment, vexation