unmovable (adj.)

• adamant
• adamantine
• firm
• frozen
• immobile
• immotile
• immovable
• impervious
• inflexible
• irremovable
• obstinate
• pat
• rigid
• standpat
• stationary
• unimpressionable
• unmoving
• unpersuadable
• unreceptive
• unresponsive
• unsusceptible
• unyielding