undeserve

As a verb undeserve

is (obsolete) to fail to deserve.

As an adjective undeserved is

not deserved, earned or merited; unjustifiable or unfair.

In obsolete|lang=en terms the difference between undeserver and undeserve

is that undeserver is (obsolete) one of no merit; one who is not worthy while undeserve is (obsolete) to fail to deserve.

As a noun undeserver

is (obsolete) one of no merit; one who is not worthy.

As a verb undeserve is

(obsolete) to fail to deserve.

As a verb undeserve

is to fail to deserve.

As a noun unreserve is

a lack or absence of reserve; frankness; freedom of communication.

As verbs the difference between undeserve and underserve

is that undeserve is (obsolete) to fail to deserve while underserve is to supply something with insufficient services or resources.

As verbs the difference between deserve and undeserve

is that deserve is to be entitled to, as a result of past actions; to be worthy to have while undeserve is (obsolete) to fail to deserve.