どんどん (rapidly/steadily)

Just by applying some rouge or lipstick, your expression and smile change more and more.

Even while I'm hesitating, it feels like I'm being driven further and further into a dead end.

She has been getting steadily better since being hospitalized.

She kept on talking about her family problems.

She kept marching steadily forward through the rain.

She's making money hand over fist.

The conversation keeps going further and further off the rails.

Don't lose heart — keep writing steadily.

The fog is getting thicker and thicker.

The balloon went higher and higher until it finally disappeared from sight.

Prices have been going up rapidly.

The wind kept getting stronger and stronger.