Unyielding in Attitude or Opinion
The Scottish Mail Crossword Answer 23 April 2017 for Unyielding in Attitude or Opinion. Answer: ADAMANT.
From English Dictionary
1. utterly unyielding in attitude or opinion in spite of all appeals, urgings, etc.
2. too hard to cut, break, or pierce.
3. any impenetrably or unyieldingly hard substance.
4. a legendary stone of impenetrable hardness, formerly sometimes identified with the diamond.