steady; sound; reliable; solid
solid; strong; sturdy; durable; stout
nucleus; backbone; medium-level; mid-level; main body (of troops); crack troops
strength; solidity; firmness; armour; armor
holding on to; sticking to
firm and unyielding; rigid
strong defense; strong defence
medium-sized enterprise (business, firm)
firm (market); bullish; strong (sales, economy, etc.); steady; sound
(a fortress being) impregnable; unassailable
very cautious (watchful, vigilant); taking every possible precaution
being of firm (unshakable) faith and strict practice
indomitable perseverance; invincible fortitude
impregnable fortress; heavily guarded fort
being faithful to one's principles; being of firm purpose and deep commitment; constancy; true blue
of strict morals (moral principles); highly moral
firm and solid; stout and durable
strong determination; strong-willed; having strong will power; firmness of purpose
center fielder; centre fielder
dogged perseverance; untiring patience
(the Christian sacrament of) confirmation
sophism; sophistry; quibbling
chaste (usu. to one's husband); faithful
pachycephalosaur (any dinosaur of infraorder Pachycephalosauria)
firm and solid; sturdy and indestructible; unshakable; adamantine