きれい

きれい
adjective (na-adjective)
beautiful, clean
1. beautiful, pretty
Describes something or someone that is aesthetically pleasing. Often used for scenery, flowers, people (especially women), and objects.
This flower is beautiful, isn't it?
I saw a beautiful view.
na-adjective form before noun
The sky is so beautiful. You can see many stars.
きれいな(ひと)です
She's a beautiful person, isn't she?
夕焼(ゆうや)きれいだった。
The sunset was beautiful.
2. clean, neat, tidy
Describes something free of dirt or mess. Used for rooms, clothes, hands, etc.
Please clean the room.
Using the 'clean' meaning
Please wash your hands thoroughly.
These clothes are still clean, so you don't need to wash them.
Eat it all up nicely.

きれい is a na-adjective with two common meanings: beautiful/pretty and clean/tidy.

FORMS:

SENSE 1 - BEAUTIFUL:

SENSE 2 - CLEAN:

WRITING:
Usually hiragana. Kanji 綺麗(きれい) exists but is less common.

GENDER NOTE:
For people, きれい is typically used for women. For men, かっこいい (cool/handsome) is more common.