The antonyms for the term "PHYS FLUIDS" (short for Physical Fluids) can depend on the context in which it is used. Generally, some antonyms for "physical fluids" may include "solid" or "gas," as these are the other two states of matter besides fluids. However, if the term specifically refers to liquids and gases that possess specific physical properties such as viscosity and flow, then antonyms may include immobile, stationary, stagnant, or solidified. Additionally, other antonyms for physical fluids can be terms such as dry, arid, or dehydrated, which are opposite in meaning to the moist, fluid nature of "physical fluids.