Synonyms for misunderstand

err, misconceive, misinterpret, miscomprehend, misjudge, miscalculate, misreckon, misapply, misconstrue, be at crosspurposes, be perplexed, be bewildered, confuse, confound, have the wrong impression, fail to understand, misapprehend, overestimate, underestimate, be misled, be unfamiliar with, be unconversant with, have the wrong slant on*, not understand all one knows*, not register*; see also mistake.

Antonyms understand*, grasp, apprehend.