Related Clues:

• Dogged determination
• "True __": John Wayne film
• Unsuitable for mixed company
• Not polished
• Wayne's was "True"
• Abrasive bits
• Unfit for younger ears
• Sandpaper coarseness measure
• Sandpaperish
• 2010 remake "True ___"
• Lacking manners
• Like a hair shirt
• Sandy stuff
• Hard particles for firmness of character
• Gravel or colloquial courage