not the sharpest tool
- dullLacking edge or interest
- dimLow in light
- slowLacking in speed
- denseClosely packed together
- thickHaving great depth
witless · clueless · dopey · obtuse · simpleton · blockhead · airhead · nitwit · dunce · fool · doofus · numbskull · halfwit · birdbrain · dimwit · naive · oblivious · shed
- Mind Idiomssharp mind, open mind, quick wit, bird brain, pea brain
- Incompetencebungle, failure, botch, inability, blunder
intelligence/mental acuity
not the sharpest toolgenius
Person of rare brilliance
brilliant · sharp as a tack · whip-smart · bright · razor-sharp