Yeshivish (ישיביש), also known as Yeshiva English, Yeshivisheh Shprach, or Yeshivisheh Reid, is a sociolect of English spoken by Yeshiva students and other Jews with a strong connection to the Orthodox Yeshiva world.
"Yeshivish" may also refer to non-Hasidic Haredi Jews. Sometimes it has an extra connotation of non-Hasidic Haredi Jews educated in yeshiva and whose education made a noticeable specific cultural impact onto them. In the latter case the term has ambivalent (both positive and negative) connotations comparable to these of the term "academic".
The term appears to be a portmanteau word of yeshiva and English, however, it may simply be formed from yeshiva + the adjectival suffix -ish.
Only a few serious studies have been written about Yeshivish. The first is a master's thesis by Steven Ray Goldfarb (University of Texas at El Paso, 1979) called "A Sampling of Lexical Items in Yeshiva English." The work lists, defines, and provides examples for nearly 250 Yes