Etymology of tardy, retardation

The adj. tardy comes from the Latin tardus (slow, dull, stupid), which some relate it to the Greek vradys/vradus (slow; Gr: βραδύς; vradus/vardus/tardus].

Others relate it to the Latin taru-dos from the v. teru-, from the Greek terys/terus [thin, weak, wιthout power; Gr: τέρυς]

From the same root: tardiness, tardily, retard, retardation, brady- (bradycardia, bradypnea, bradykinesia etc).

In modern Greek:
a) vradys (bradys): slow [Gr: βραδύς]

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