Examples:

• He's a tough cookie, but I can handle him.
• He said his wife is a tough cookie, a breast cancer survivor who battled the disease for nearly ten years.
• There was a tough cookie in here this morning who demanded to see the manager.
• He's one tough cookie and he picked himself up and came back into the ring for more sparring.
• She is one brave tough cookie for sharing her experience here on this forum.
• You have to be a pretty tough cookie to have qualified as a lawyer while raising a family.
• Being a dedicated tough cookie , he has delivered the goods in impressive manner.
• In a male-dominated field, sometimes I don't get taken seriously. But I'm a tough cookie and the guys quickly learn not to judge me on the way I look.
• I am a tough cookie and I will not take any nonsense from anyone .