adjective
1.
Synonyms: strong 2, stalwart, stout, sturdy, tough
Related Word: bulldogged, bulldoggish, bulldoggy, dogged, obstinate, pertinacious, stubborn; resolute, steadfast, true; persevering, persisting
2.
Synonyms: viscous , tough, viscid, viscose
Related Word: cohesive; tacky; sticky
3.
Synonyms: fast 4, firm, fixed, secure, set, tight
Contrasted words: lax, slack