Colder in store, 7 letters
Less emotional, 7 letters
Less expressive, 7 letters
Less forgiving, 7 letters
Less sympathetic, 7 letters
More obdurate, 7 letters
More pitiless, 7 letters
More poker-faced, 7 letters
More rocky, 7 letters
More unfeeling, 7 letters
More unyielding, 7 letters
Not as warm, 7 letters
Least arable, perhaps, 8 letters
Maximally unfriendly, 8 letters
Most rocky, 8 letters
Most unfeeling, 8 letters
In a coldly inexpressive way, 7 letters
In an inflexible way, 7 letters
In an obdurate way, 7 letters
Without expression, 7 letters
Impassivity, 9 letters
Lack of pity, 9 letters
Old form of capital punishment, 7 letters
Pelting with rocks, 7 letters
Saint Stephen's punishment for blasphemy, 7 letters
Remove the pits from, as of certain fruit such as peaches, 7 letters
Removing stems and seeds?, 11 letters