holding fast; characterized by keeping a firm hold (often fol. by of )

a tenacious grip on my arm; tenacious of old habits.

highly retentive

a tenacious memory.

pertinacious, persistent, stubborn, or obstinate.

adhesive or sticky; viscous or glutinous.

holding together; cohesive; not easily pulled asunder; tough.

adjective

surrendering , weak , yielding , loose , slack , unattached

adjective

adamant , bound , clinging , coherent , cohesive , determined , dogged , fast , firm , forceful , inflexible , intransigent , iron , meaning business , mulish , obdurate , obstinate , persevering , persistent , persisting , pertinacious , possessive , purposeful , relentless , resolute , retentive , set , solid , spunky , stalwart , staunch , steadfast , stout , strong-willed , stubborn , sturdy , sure , tight , tough , true , unforgetful , unshakable , unswerving , adhesive , clingy , fixed , glutinous , gummy , inseparable , mucilaginous , resisting , secure , tacky , viscid , viscose , viscous , waxy , bullheaded , hardheaded , headstrong , perverse , pigheaded , stiff-necked , willful , indomitable , sticking , strong , unyielding