tenacious

Synonyms: 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 strongwilled stubborn sturdy sure tight tough true unforgetful unshakable unswerving

Antonyms: surrendering weak yielding

Synonyms: adhesive clinging clingy fast firm fixed glutinous gummy inseparable mucilaginous resisting retentive secure set tacky tight viscid viscose viscous waxy

Antonyms: loose slack unattached