Transparent
Transparency
noun, な adjective, の adjective
Something that is transparent and bright so that you can see through it is transparent.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
透明人間の男は、バスタオルで自分の体をよーく拭きました。
The invisible man carefully dried himself with a bath towel.