This new detergent is completely odorless.

This diamond is completely colourless, which is very rare.

It became clear that he was complicit in the crime.

He had a hand in that plan.

Carbon monoxide is a colorless, odorless gas, and it is dangerous to inhale.

This road is dangerous, so please be careful.

Please avoid this road because it's dangerous.

He inhales the medicine prescribed by his doctor every day.

He took a deep breath and inhaled the fresh air.

He participated in the plan.