Whimsical describes something odd or fanciful in a light, playful way that makes you smile. A house painted with cartoon fish, a shop that sells only tiny hats, a story where the teapot talks — these are whimsical. The idea is: it is strange, but the strangeness is gentle and fun, not frightening and not serious. Nobody made it that way for a good practical reason; someone made it that way because it was charming.

You will meet it most often about art, design, films, books, decoration, and clothes. 'A whimsical little film', 'whimsical illustrations', 'a whimsical garden full of small doors'. Reviewers love this word.

There is a second, less sunny use, and it is worth knowing. If you call a *person* or a *decision* whimsical, you usually mean they change with no reason — they follow their whims. 'The rules here are whimsical' is not a compliment: it means the rules change depending on someone's mood, and you cannot rely on them. So the same word praises a picture book and criticises a boss.

Also know that in the art world, calling something whimsical can be a quiet way of saying it is pretty but light — sweet, not deep. Whether that is praise depends on the speaker's tone. It is a normal written-and-spoken word, slightly literary, but not difficult or old.