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Latin word piger comes from Proto-Indo-European *peyǵ-
*peyǵ- (Proto-Indo-European)
pigeo (Latin)
(third person, singular, impersonal) (+accusative of the person, +genitive of the thing) it irks, pains, disgusts, afflicts, grieves. To feel annoyance or reluctance at; to repent of.
piger (Latin)
Backward, slow, dull, lazy, indolent, sluggish, inactive.