What is the meaning of the word "soft"?

Definitions:

(of a commodity or market or currency) falling or likely to fall in value adjective
- the market for computers is soft
(of sound) relatively low in volume adjective
- soft voices
easily hurt adjective
- soft hands
not brilliant or glaring adjective
- the moon cast soft shadows
not protected against attack especially by nuclear weapons adjective
- The bunkers were soft targets.
using evidence not readily amenable to experimental verification or refutation adjective
- soft data