As a verb mainprised
As an adjective mainpernable is
(legal) capable of being admitted to give surety by mainpernors; able to be mainprised.
(legal, historical) A writ directed to the sheriff, commanding him to take sureties, called mainpernors, for the prisoner's appearance, and to let him go at large.
(legal, historical) Deliverance of a prisoner on security for his appearance at a day.
(legal) To allow (a prisoner) to go at large, on his finding sureties, or mainpernors, for his appearance on a given day.
(legal) Capable of being admitted to give surety by mainpernors; able to be mainprised.