Clue: Hard to penetrate
We have 1 answer for the crossword clue Hard to penetrate.
Possible Answers:
Related Clues:
- Not too bright
- Dumb
- Thick
- Like a blockhead
- Crowded
- Cement-headed
- Crammed
- Thickly packed
- None too bright
- (k) Thick
- Slow-witted
- Opaque
- Highly concentrated
- Not the brightest bulb on the tree
- Simple-minded
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- Dimwitted
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- A few bricks shy of a load
- Postman's beat
- ... and 36 more.
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