Pallid means unhealthily pale. A pallid face, pallid and drawn, pallid light.
It is stronger than pale and always suggests something wrong, since a pallid complexion is one a doctor would notice. Of a performance it means feeble and washed out, which is the figurative use.
1adjectivepallidUnhealthily pale.
“After weeks in hospital, his face was thin and pallid.”
pallid is a quality.
Latin pallidus means pale, from pallere, to be pale; pale is a doublet.
Proto-Indo-European
*pelH-
Latin
pallidus
English, today
pallid
From Latin pallidus. From Latin pallidus. a doublet of pale.
Etymology from Wiktionary, CC BY-SA