bitter: sharp, biting, and unpleasant to the taste.
adjetive: The bitter Quassia contains indoic alkaloids, terpenoids, bitter-tonic and coumarins.
bright: giving out or reflecting a lot of light; shining.
adjective:The Grand Hotel Baglioni has 193 rooms, spacious and bright.
excited: very enthusiastic and eager.
adjective: He gets excited when someone comes to buy a book.