Hare-brained and Spur-of-the-moment

Spur-of-the-moment and hare-brained are semantically related. In some cases you can use "Spur-of-the-moment" instead an adjective phrase "Hare-brained".

Spur-of-the-moment adjective - Made or done without previous thought or preparation.

Hare-brained and spur-of-the-moment are semantically related. Sometimes you can use "Hare-brained" instead an adjective phrase "Spur-of-the-moment".