unpliable
/(ˌ)ʌnˈplʌɪəbl/adjective
1Not easily influenced or persuaded; obstinate, stubborn; unconforming.
2Not easily bent or changed in shape; stiff, rigid, inflexible.
3Not (readily) adaptable to different purposes, changing circumstances, etc.; not showing adaptability or versatility.
Origin
Late Middle English; earliest use found in The Wycliffite Bible (early version). From un- + pliable.