tenacious (adj.)
- adamant
- adherent
- adhesive
- amylaceous
- assiduous
- balking
- balky
- bigoted
- bound
- bullheaded
- cartilaginous
- case-hardened
- chewy
- clammy
- clotted
- coagulated
- cohesive
- committed
- constant
- continuing
- coriaceous
- curdled
- decided
- decisive
- dedicated
- definite
- determined
- devoted
- diligent
- dogged
- dogmatic
- doughy
- durable
- earnest
- enduring
- faithful
- fanatic
- fibrous
- firm
- fixed
- game
- gamy
- gelatinous
- gluey
- glutinous
- good
- gooey
- grasping
- gripping
- gristly
- gritty
- grumous
- gummy
- gutsy
- hard
- hardheaded
- hardy
- headstrong
- heavy
- holding
- immovable
- immutable
- inalterable
- indefatigable
- indomitable
- industrious
- inflexible
- insistent
- intolerant
- intransigent
- invincible
- jelled
- jellied
- jellylike
- keeping
- lasting
- leatherlike
- leathery
- loyal
- mettlesome
- mucilaginous
- mulish
- nervy
- obdurate
- obstinate
- opinionated
- overzealous
- pasty
- patient
- permanent
- persevering
- persistent
- persisting
- pertinacious
- pigheaded
- plodding
- plucky
- preoccupied
- purposeful
- rapt
- red-blooded
- refractory
- relentless
- resistant
- resolute
- resolved
- restive
- retentive
- rigid
- ropy
- secure
- sedulous
- self-willed
- serious
- set
- sincere
- sinewy
- single-minded
- sleepless
- slimy
- slithery
- spirited
- spunky
- stable
- stalwart
- starchy
- staunch
- steadfast
- steady
- sticky
- stiff
- stiff-necked
- stodgy
- stout
- stringy
- strong
- strong-minded
- strong-willed
- stubborn
- sturdy
- sulky
- sullen
- syrupy
- tacky
- thick
- thickened
- tight
- tireless
- tough
- true
- uncompromising
- unconquerable
- uncooperative
- undaunted
- undiscouraged
- unfailing
- unfaltering
- unflagging
- unflinching
- uninterrupted
- unregenerate
- unrelenting
- unremitting
- unshakable
- unshaken
- unsleeping
- unswerving
- untiring
- unwavering
- unwearied
- unwearying
- unyielding
- vigorous
- viscid
- viscous
- wholehearted
- willful
- wiry
