Here's the MW synonym entry for animadversion:

Entry Word: animadversion
Function: noun
Text: a remark or statement that constitutes an adverse and usually uncharitable criticism <her spiteful animadversions on her neighbors' children>
Synonyms aspersion, obloquy, reflection, slam, slur, stricture
Related Word censure, criticism, reprehension; accusation, imputation, insinuation; captiousness, carping, caviling, faultfinding
Contrasted Words acclaim, extolling, laudation, praise; approbation, approval
Antonyms commendation