softer
3 occurrences across the corpus
King James Version
Psalms 55:21
The words of his mouth were smoother than butter, but war was in his heart: his words were softer than oil, yet were they drawn swords.
OT Pseudepigrapha
2 Enoch 29:1
AND for all the heavenly troops I imaged the image and essence of fire, and my eye looked at the very hard, firm rock, and from the gleam of my eye the lightning received its wonderful nature, which is both fire in water and water in fire, and one does not put out the other, nor does the one dry up the other, therefore the lightning is brighter than the sun, softer than water and firmer than hard rock.
4 Maccabees 7:4
For women are softer of soul than men, and the more children they bear the more do they abound in love for them.