steadfast in purpose or intention; unalterable, unyielding
not capable of being affected or moved in feeling; impassive
not liable to be removed; permanent in place or tenure; fixed
incapable of being physically moved; fixed
that which can not be moved; something which is immovable
A voter etc. who has not yet come to a decision.
Uncommitted, not having reached a decision.
Open and not yet settled or determined.