The most common and most likely answer to this crossword clue is the 5 letter word THUGS which also is the latest solution we found used in Newsday in 2013.
Unforgiving muscle crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| THUGS | 100 % | 5 | 
Words with a meaning similar to the clue: Unforgiving muscle
These words may or may not be a possible solution to this crosswords clue.- relentless
 - toning
 - acerb
 - acerbic
 - acid
 - acrid
 - bitter
 - blistering
 - caustic
 - coarse
 - crack
 - cracked
 
Crossword Answer definitions
THUGS noun- Someone with an intimidating and unseemly appearance and mannerisms, who treats others violently and roughly, often for hire.
 - One of a band of assassins formerly active in northern India who worshipped Kali and offered their victims to her.
 - In gardening, an over-vigorous plant that spreads and dominates the flowerbed.
 - A punk; a hoodlum; a hooligan.
 
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution