This castle is of solid construction and withstood enemy attacks.
His resolve is firm and cannot be shaken by anyone.
This castle wall is extremely solid.
She has a firm will and never gave up on the plan halfway through.
The team blocked the opponent's attack with a solid defense.
This mountain castle is known as a formidably fortified castle.
丈夫 is the everyday word for something sturdy or a person being healthy, while 堅固 is more formal and often used for structures, fortifications, or firm resolve.
堅固 describes something solidly built or firmly held (like a fortress or resolve), whereas 不動 emphasizes that it simply does not move or waver.
堅固 often describes physical or structural firmness (a fortress, a body) as well as firm resolve, whereas 確固 is used almost exclusively for mental attitudes and beliefs.
脆弱 means fragile or weak, the direct opposite of 堅固's solid, unyielding strength.
firm and solid; stout and durable
steadfast principles; firm resolve; constancy
strong determination; strong-willed; firmness of purpose
extremely cautious; taking every precaution
impregnable; unassailable
Standard kanji spelling for this word.
Compound of 堅 (hard, firm) and 固 (hard, solid). The exact historical derivation is uncertain, but the meaning follows from the kanji components.