Gentler

As he grew older, he became gentler.

Imperious Prima flashes forth / Her edict "to begin it"— / In gentler tone Secunda hopes / "There will be nonsense in it!"— / While Tertia interrupts the tale / Not more than once a minute.

He doesn't respond well to criticism, so you might want to find a gentler way of wording your concerns.

When Yanni is with Skura, he always shows his gentler side.