As an adjective unterminated
is not terminated.
As a noun pushlet is
(internet|rare) a push mechanism in which the web server takes advantage of persistent http connections and leaves the response unterminated so that it can continue to send information.
pushlet
English
Noun
(
en noun)
(Internet, rare) A push mechanism in which the Web server takes advantage of persistent HTTP connections and leaves the response unterminated so that it can continue to send information.