Mid 19th century; earliest use found in Isaac Taylor (1787–1865), writer on theology, artist, and inventor. Either from misadjust + -ed, or from mis- + adjusted.
Definition of misadjusted in US English:
misadjusted
adjectiveˌmɪsəˈdʒʌstɪd
Badly adjusted.
Origin
Mid 19th century; earliest use found in Isaac Taylor (1787–1865), writer on theology, artist, and inventor. Either from misadjust + -ed, or from mis- + adjusted.