(a.) Not to be persuaded; obstinate; unyielding\; impersuasible.

arcane authoritarian beyond reach bigot bigoted blank blind blind-alley borne cabalistic cecal censored choked choked off classified close closed forever to closed to concealed constricted contracted cramped creedbound cryptic dark dead dead-end deaf deaf to reason enigmatic esoteric fanatical hermetic hidden hidebound hush-hush illiberal impenetrable impersuadable impersuasible impervious inaccessible inflexible inhospitable insular latent little little-minded lost to mean mean-minded mean-spirited mysterious narrow narrow-hearted narrow-minded narrow-souled narrow-spirited nearsighted obstinate occult out of reach parochial petty provincial purblind restricted secret shortsighted shut small small-minded smothered squeezed shut stifled straitlaced strangulated stuffy suppressed top secret ulterior un-come-at-able unaccessible unamenable unapproachable unattainable unavailable unbreatheable uncatholic uncharitable uncordial under security under wraps undisclosable undisclosed undiscoverable undivulgable undivulged unfriendly ungenerous ungettable ungracious unhospitable unimpressionable uninfluenceable unliberal unmovable unneighborly unobtainable unopen unopened unpersuadable unpliable unprocurable unreachable unreceptive unresponsive unrevealable unrevealed unsecurable unspoken unsuggestible unsusceptible unswayable untellable untold unutterable unuttered unvented unventilated unwhisperable unyielding