Strong
Strength, Powerful
noun, な adjective
You have strong power. You are strong and powerful. Feel your strength.
This is a jukugo word, which usually means on'yomi readings from the kanji. Since 力 has two on'yomi readings, here's a mnemonic to help you remember which one to use:
Nothing is as strong and powerful as the きょうと lock (きょうりょく). It's a legendary lock produced in ancient きょうと, rumored to be the strongest lock in existence. What magical powers do you think lie behind the strength of the きょうと lock?
このヘアドライヤーは、かなり強力だ。
This hair dryer is quite powerful.
強力なスプレーで虫は全て死にました。
All bugs died with some strong spray.
ピカチュウはレベルアップして、強力になった。
Pikachu leveled up and has more power now.