retentive, sticky, inseparable, waxy, resisting, gummy, coriaceous, viscous, viscid, glutinous; see also adhesive, tough 2.
Antonyms loose*, lax, slack.
determined, pertinacious, purposeful, resolute; see obstinate, resolute 2.
"tenacious." YourDictionary, n.d. Web. 17 August 2018. <http://thesaurus.yourdictionary.com/tenacious>.
tenacious. (n.d.). Retrieved August 17th, 2018, from http://thesaurus.yourdictionary.com/tenacious
Tenaciously unwilling to yield:
Persistently holding to something: