aggravation, annoyance, bad news, bedevilment, bore, bother, botheration, bothersomeness, chase, chasing, crashing bore, devilment, difficulty, downer, drag, exasperation, follow, follow-up, following, harassment, harrying, headache, heeling, hounding, hue and cry, hunting, molestation, nuisance, persecution, pest, problem, prosecution, pursual, pursuance, pursuing, pursuit, quest, searching, seeking, sequel, sequence, series, shadowing, stalking, tailing, tracking, tracking down, trailing, trial, trouble, vexation, vexatiousness, worriment, worry