achromatic
adjective
ach·ro·mat·ic
ˌa-krə-ˈma-tik
(ˌ)ā-
1
: refracting light without dispersing it into its constituent colors : giving images practically free from extraneous colors
an achromatic telescope
2
: not readily colored by the usual staining agents
3
: possessing no hue : being or involving black, gray, or white : neutral
achromatic visual sensations
4
: being without accidentals or modulation : diatonic
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Merriam-Webster unabridged
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