(adj-na,n) solid
strong
firm
(P)
(n,adj-na) strong determination
strong-willed
having strong will power
firmness of purpose
(n) firm and solid
sturdy and indestructible
unshakable
adamantine
(n,adj-na) firm and solid
stout and durable
(n,adj-na) being faithful to one's principles
being of firm purpose and deep commitment
constancy
true blue
(n,adj-na) being of firm (unshakable) faith and strict practice
(n,adj-na) of strict morals (moral principles)
highly moral
(n,adj-na) very cautious (watchful, vigilant)
taking every possible precaution
(n,adj-no) (a fortress being) impregnable
unassailable
