Replace the bold word in the following sentence with a synonym: He ventured out into the unknown.
He ventured out into the unknown.
He journeyed out into the unknown.
Complete the following task based on the instruction and optional input provided.### Instruction:
Replace the bold word in the following sentence with a synonym: He ventured out into the unknown.

### Input:
He ventured out into the unknown.

### Output:
He journeyed out into the unknown.