The Collaborative International Dictionary
Misunderstander
Misunderstander \Mis*un`der*stand"er\
(m[i^]s*[u^]n`d[~e]r*st[a^]nd"[~e]r), n.
One who misunderstands.
--Sir T. More.
Wiktionary
misunderstander
n. One who misunderstands.