- - Harder to see through, as ocean waters
- - Harder to see through, say
- - Harder to see in
- - More black
- - Blacker
- - More like a squid's defense
- - More murky
- - Like deeper ocean depths
- - More murky or shadowy
- - More pitch-black
- - More dark
- - More like ocean depths
- - Darker
- - Comparatively dark
- - Comparatively black
- - More shadowy
- - More like printers' fingers
- - More Stygian.
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