a person who adheres rigidly to a dogma, theory, or plan.
Origin of hard-liner
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for hard-liner
Contemporary Examples of hard-liner
Likud back-benchers, already alarmed at the specter of renewed peace talks, have begun thumping for a hard-liner in that key post.Obama Complicates Netanyahu’s Coalition Talks
J. J. Goldberg
February 7, 2013