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Latin word pallidus comes from Latin palleo, Latin -idus ((suffix forming verbs) tending to.)
palleo (Latin)
I am pale; I turn pale, blanch.. I fade, lose color, change color.. I grow pale, am anxious, am fearful.
-idus (Latin)
(suffix forming verbs) tending to.
pallidus (Latin)
(by extension) musty, moldy. (figuratively) frightened, pale with fright. Greenish. In love. Pale, pallid. That makes or causes a pale condition.