His eyes are a deep blue.

This lake is very deep.

His eyes were filled with deep sorrow.

Don't take his joke seriously.

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

He continues his journey in pursuit of utopia.

She is looking for an ideal partner.

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

He is an idealist, always seeking perfection.

She is planning a date with her current boyfriend.