Answer: sheerest

AnswerCrossword Clue
SHEERESTMost diaphanous
SHEERESTMost gauzy.
SHEERESTPurest.
SHEERESTMost pure.
SHEERESTMost steep
SHEERESTMost transparent
SHEERESTMost gossamery
SHEERESTMost see-through
SHEERESTMost thin, as fabric
sheerestNothing other than; unmitigated (used for emphasis)
sheerest(esp. of a cliff or wall) Perpendicular or nearly so
sheerestSHEER, of very thin texture
sheerest(of a fabric) Very thin; diaphanous