A decision that's not very smart or well thought out can be called injudicious. It would be injudicious to spend your last five dollars on a fancy coffee drink.

When you regret something you've done, you might decide in retrospect that it was injudicious. It's injudicious to spread rumors about a friend, because it's not thoughtful. It's also injudicious to ride in a fast-moving car without a seat belt, because it's dangerous. Judicious means "showing good judgment," from the Latin root iudicium, or "judgment."

Definitions of injudicious
  1. adjective
    lacking or showing lack of judgment or discretion; unwise
    “an injudicious measure”
    “the result of an injudicious decision”
    not prudent or wise
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