Aboveboard (adjective)

Open, honest and straightforward; not secretive or deceitful.

Origin:

From the phrase "with the board above", meaning "in plain sight".

Examples:

1. The businessman conducted his dealings aboveboard.
2. The company's financial records were aboveboard.
3. His intentions were always aboveboard.
4. Their negotiations were aboveboard and transparent.
5. The politician's campaign was aboveboard and without any hidden agenda.