A real gas behaves least like an ideal gas under the conditions of

Higher temperature and Lower pressure

Explanation:

A real gas behaves more like an ideal gas at higher temperature and lower pressure, as the potential energy due to intermolecular forces becomes less significant compared with the particles' kinetic energy, and the size of the molecules becomes less significant compared to the empty space between them

What is a real gas?

A real gas is a gas that does not behave according to the assumptions of the kinetic molecular theory

What is an idea gas?

a hypothetical gas whose molecules occupy negligible space and have no interactions, and which obeys the gas law assumptions