unbending (adj.)

• adamant
• adamantine
• aloof
• cast-iron
• constant
• direct
• distant
• dour
• even
• firm
• fixed
• flat
• flinty
• fundamentalist
• grim
• hard
• hard-core
• hidebound
• horizontal
• immovable
• immutable
• implacable
• inelastic
• inexorable
• inextensible
• inflexible
• intractable
• intransigent
• iron
• ironclad
• irreconcilable
• level
• lineal
• linear
• loyal
• muscle-bound
• obdurate
• obstinate
• offish
• orthodox
• procrustean
• puritanic
• rectilineal
• rectilinear
• relentless
• reserved
• right
• rigid
• rigorous
• rock-ribbed
• rockbound
• set
• settled
• single-minded
• smooth
• standoffish
• staunch
• steadfast
• steady
• steely
• stern
• stiff
• straight
• straightlaced
• straitlaced
• streamlined
• stubborn
• true
• unaffected
• unalterable
• unapproachable
• unbent
• unbowed
• unbroken
• unchangeable
• uncommunicative
• uncompromising
• uncurved
• undeviating
• undistorted
• unflappable
• uninterrupted
• unmalleable
• unmoved
• unrelenting
• unshaken
• unswerving
• unturned
• unyielding
• upright
• vertical
• withdrawn