Etymology

unlightable

un·light·a·ble
U1N1L1I1G2H4T1A1B3L1E1

Today it means: Incapable of being illuminated or made light or bright; unable to affix with a light. Full definition →

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The story

From un- (“not”) + lightable (“capable of being lighted”).

Etymology from Wiktionary, CC BY-SA 4.0.