Kittenishnesses is a rather unusual word, but it does have synonyms that capture its meaning. Some alternative words that can be used in place of kittenishnesses include coy behavior, playfulness, and sprightliness. These words convey a sense of youthful energy, innocence, and a playful attitude. A kitten is often associated with these qualities, and these words reflect that image. Additionally, the word kittenishnesses can be replaced with other words that describe similar traits, such as frolicsomeness, friskiness, or liveliness. Whatever the word used, it should express a sense of youthful energy and a playful demeanor.