to continue firmly in a course of action or effort despite difficulty or opposition

firm; resolute; determined

firm and resolute in character, will, or endurance; resilient and staunch

firm and unwavering in purpose, belief, or character

to believe firmly or without any doubt

having a strong, sound, and reliable foundation or basis

to stick strictly to a post, duty, or principle

firm and unshakable in purpose, belief, or policy

physically strong, solid, and resistant to damage or collapse

physically firm and resistant to pressure; solid and rigid

to persevere unremittingly; to keep going until the end

persistent and resilient in character or spirit; unyielding

to assault a fortified position

firm and upright in physical posture or general structure

the central, most important, or mainstay part of a group or organization; the backbone

firm and persistent; showing unswerving determination

to firmly maintain or assert a statement or fact, especially in the face of doubt or opposition

(idiom) invulnerable; indestructible; impregnable

firm and indomitable; tenacious and unyielding

Sun Jian (155-191), famous general at the end of the Han dynasty and forerunner of the southern kingdom of Wu during the Three Kingdoms period.

showing grit and determination; remaining steadfast and persistent despite hardship or difficulty

to overcome any obstacle or stronghold; to be invincible and irresistible in force or power

the quality of being firm, resolute, or unwavering in purpose or belief

first Sui emperor Yang Jian (541-604), reigned 581-604

firm and unswerving in one's character, conviction, or will

firm and indomitable; fortitude

Fu Jian (338-385), emperor of Former Qin [[前秦|前秦|Qian2 Qin2]], reigning from 357-385

solid as a boulder; absolutely stable, strong, and enduring

Huang Tingjian (1045–1105), Song Dynasty poet and calligrapher

faithful and unchanging (idiom); firm and unyielding

a figurative deadlock or state of coldness between people or groups

staunch and unyielding; steadfast

firmness; sturdiness

to fortify defenses and raze the fields to leave nothing for an invader; scorched earth policy

to stick to something without change; to persevere

strong, solid, and durable in construction or composition

to cache or hide supplies (especially from the enemy)

unyielding integrity; unwavering

to firmly adhere to or continue upholding a position, belief, or course of action

confirmation (Christian ceremony)

persisting through extreme hardship; showing conspicuous determination

maintaining one's ambition and resolve despite being in poverty or facing extreme hardship; the worse one's position, the more determined one must become

to live in luxury; literally to ride a solid carriage pulled by fat horses

tenge, the currency of Kazakhstan (loanword)

the Gini coefficient (specifically used in Hong Kong)

love is more solid than gold