Clue: Hard to penetrate
We have 1 answer for the clue Hard to penetrate. See the results below.
Possible Answers:
Related Clues:
- Thick
- None too bright
- None too brainy
- Not too swift
- Thickheaded
- Impenetrable
- Crowded
- Packed tight
- Blockish
- Not the brightest bulb on the tree
Last Seen In:
- USA Today - October 18, 2005
- Washington Post - July 11, 2004
- USA Today - March 16, 2004
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