精神力 /sei shin ryo ku/ meas 'strength of will, willpower' as a noun. 意志堅固 /i shi ken gou/ means 'strong-willed, determined' as an adjective. If you are referring to the Naruto anime term 'hi no ishi' it is 火の意志 and means 'will/determination of fire'.
As a name an example could be 高意 /ta ka o ki/ meaning 'high-willed, strong-hearted'.
You may say 'tsuyoi,' written in Japanese as: 強い
strong storms
No.
Forceful, powerful, and strong
It means strong or tough.
You may say 'shikkari shite (kudasai.)'
A strong emperor who was supported by shoguns and samurai.
Japan has the world's third largest economy.
tsuyoi, utsukushii Seichō shitte
Yamato
Lust is seiyoku in Japanese and it is written like this: 性欲.
That translates into English as 'chak strong' - which translates into Japanese as 強いチャク