As a verb unrung
is (unring).
As an adjective untolled is
on which no toll is charged.
unrung
English
Verb
(head)
(unring)
unring
English
Verb
To reverse ringing
Usage notes
*Because the act of reversing ring is impossible, almost all usage of the word will be with "not". The principle use is in the proverbial "You can't unring a bell."
Derived terms
*unring a bell
*you can't unring a bell
untolled
English
Adjective
(-)
On which no toll is charged.
(rare, poetic) Not having been tolled; unrung.