Kookiness is a word used to describe someone or something that is odd, eccentric, or peculiar. There are several different synonyms that can be used to describe kookiness, including quirkiness, zaniness, craziness, eccentricity, or strangeness. Quirkiness is often used to describe something that is funny, unusual, or a bit off-beat. Zaniness, on the other hand, usually describes something that is wild, frenzied, or chaotic. Craziness could refer to something that is completely wild and out of control. Eccentricity suggests that someone or something is a bit unusual or strange, while strangeness implies that something is simply out of the ordinary.