Speak unfavorably about.

synonyms: badmouth, malign, traduce.

Roget 929: hold in disrespect etc. (despise) 930; misprize, disregard, slight, trifle with, set at naught, pass by, push aside, overlook, turn one's back upon, laugh in one's sleeve; be disrespectful etc. adj., be discourteous etc. 895; treat with disrespect etc. n.; set down, put down, browbeat.    dishonor, desecrate; insult, affront, outrage.    speak slightingly of; disparage etc. (dispraise) 932; vilipend^†, vilify, call names; throw dirt, fling dirt; drag through the mud, point at, indulge in personalities; make mouths, make faces; bite the thumb; take by the beard; pluck by the beard; toss in a blanket, tar and feather.    have in derision; hold in derision; deride, scoff, barrack, sneer, laugh at, snigger, ridicule, gibe, mock, jeer, hiss, hoot, taunt, twit, niggle^†, gleek^†, gird, flout, fleer^†; roast, turn into ridicule; burlesque etc. 856; laugh to scorn etc. (contempt) 930; smoke; fool; make game of, make a fool of, make an April fool of^†; play a practical joke; lead one a dance, run the rig upon, have a fling at, scout; mob.    ... show more

Dutch: lasteren, kwaadspreken