Acumen

/əˈkjuː.mən/ noun medium

The ability to make fast, accurate judgments and decisions in a particular field.

Her sharp business acumen allowed her to spot a profitable opportunity that every other investor had overlooked.

Memory Trick

The word contains 'acu-,' as in 'acute' or 'acupuncture' — sharp acumen is a mind that pierces straight to the right answer like a fine needle.