We have a responsibility to make this world a better place.

She is looking for an ideal partner.

He is an idealist, always seeking perfection.

The law of ideal gas is a basic concept in physics.

Her idealized form is someone who is always smiling and kind.

He continues his journey in pursuit of utopia.

He spends a lot of time for peacekeeping.

He is a pacifist and absolutely does not support war.

He lost everything.

She is planning a date with her current boyfriend.