unpliable

Hardened is a related term of unpliable.

As adjectives the difference between hardened and unpliable

is that hardened is unfeeling or lacking emotion due to experience; callous while unpliable is not pliable.

As a verb hardened

is (harden).

Firm is a related term of unpliable.

As adjectives the difference between firm and unpliable

is that firm is steadfast, secure, hard (in position) while unpliable is not pliable.

As a noun firm

is (uk|business) a business partnership; the name under which it trades.

As a verb firm

is to make firm or strong; fix securely.