(a.) Implying or imputing evil; depreciatory; disparaging; unfavorable.

abusive back-biting belittling bitchy calumniatory calumnious catty censorious contemptuous contumelious defamatory deprecatory depreciative depreciatory derisive derisory derogative derogatory detracting detractory disadvantageous disparaging libelous minimizing ridiculing scandalous scurrile scurrilous slanderous slighting uncomplimentary vilifying