1) Abase 2) Rip 3) Traduce 1) Asperse 2) Besmirch 3) Calumniate 4) Criticize harshly 5) Criticize severely 6) Defame 7) Denigrate 8) Disparage 9) Drag through the mud 10) Malign 11) Put down 12) Slander 13) Smear 14) Smirch 15) Speak ill of 16) Speak unfavorably about 17) Sully 18) Talk smack about 19) Traduce 
[v] - speak unfavorably about
malign verb speak unfavorably about; `She badmouths her husband everywhere`