v. 25B6; verb
his behaviour does niggle me : IRRITATE, annoy, bother, provoke, exasperate, upset, gall, irk, rankle with; informal rile, get to, bug.
he niggles on about taxes : COMPLAIN, fuss, carp, cavil, grumble, grouse; informal moan, nit-pick.
25B6; noun niggles about the lack of equipment : QUIBBLE, trivial complaint, criticism, grumble, grouse, cavil; informal gripe, moan, beef, grouch.