difficult nut to crack

difficult nut to crack synonyms

tough nut to crack compare difficult nut to crack and tough nut to crack
hard nut to crack compare difficult nut to crack and hard nut to crack
harder nut to crack compare difficult nut to crack and harder nut to crack
tougher nut to crack compare difficult nut to crack and tougher nut to crack
hardest nut to crack compare difficult nut to crack and hardest nut to crack
toughest nut to crack compare difficult nut to crack and toughest nut to crack

difficult nut to crack antonyms