A profitable side business could be selling refurbished furniture like the dresser shown.
The definition of profitable is something with a financial gain or benefit.
An example of profitable is a dresser bought from a thrift store for $10 that you're able to sell for $50.
yielding profit, gain, or benefit
Yielding profit; advantageous: an investment that was barely profitable.
- prof′it·a·bil′i·ty prof′it·a·ble·ness