Resembling, suggestive of, or having the quality of death; deathly or corpselike.
From 'death' plus the diminutive/descriptive suffix '-y'. Informal variant of 'deathly,' used colloquially to describe something that looks or feels like death.
It's the informal, almost joking version of 'deathly'—when something's a little bit morbid, a little bit creepy, people say 'that's pretty deathy' where their grandparents would say 'ghastly.'
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