imperceptibly

The temperature dropped imperceptibly throughout the night.

She smiled imperceptibly at his joke.

Time passed imperceptibly as they chatted away.

His mood changed imperceptibly as he listened to the music.

The colors of the sunset shifted imperceptibly from orange to pink.

The old man's strength faded imperceptibly with age.

She inched imperceptibly closer to him on the park bench.

The scent of flowers filled the room imperceptibly.

His influence on the team grew imperceptibly over time.

The sun dipped below the horizon imperceptibly, signaling the end of the day.