A boulder is a large stone. Bold means brave in the face of danger, outspoken, brash, or adventurous.
- The boulder rolled down the mountain.
- After he picked out his new suit he immediately felt bolder and more confident in himself.
In the same sentence:
- There was one boulder that stood out from the rest; it was far bolder in it's colouring and it's shape was quite pronounced.
- Despite the danger he showed himself to be much bolder than the other members of the expedition, by scaling the rock face and finding a perfect boulder to use as shelter for the night.
