remonstrant

Noun

 * 1) One who remonstrates, or issues (usually formal and written) protestations.

Adjective

 * 1) Inclined or tending to remonstrate; expostulatory; urging reasons in opposition to something.

Etymology
Borrowed from. The religious meaning derives from the Remonstrance provided to the States of Holland in 1610, after.

Noun

 * , objector
 * , objector