niggling

adj 1 too unimportant to give time or attention to; trifling 不值得费时或操心的; 无关紧要的; 琐碎的: Don't waste time on niggling details. 不要为琐事浪费时间. 2 annoying in a minor but persistent way 令人烦恼的, 讨厌的（事不大但不断）: a niggling pain 烦人的疼痛 * niggling criticism 恼人的批评.

niceness, nicety, niche, nick, nick-nack, nickel, nickel silver, nickname, nicotine, niece, niff, niffy, nifty, Nigeria, Nigerian, niggard, niggardliness, niggardly, nigger, niggle, nigh, night, night after night, night and day, night porter, night safe, night shift, night-bird, night-blindness, night-club, night-gown, night-life, night-light, night-line, night-long, night-school, night-shirt, night-soil, night-staff, night-time,