As nouns the difference between softness and malacosteon
is that softness is the quality of being soft while malacosteon is morbid softness of the bones; osteomalacia.
softness
English
Noun
(-)
The quality of being soft.
Antonyms
* hardness
malacosteon
English
Noun
(-)
(pathology) Morbid softness of the bones; osteomalacia.