Meaning

noun a quantity that is more than what is appropriate

adjective very great in quantity; overabundant

adverb more than necessary

originFrom Middle English overmuche, overmuchel, from Old English ofermiċel, ofermyċel (“overmuch, excessive”), equivalent to over- + much. Compare overmany and overmore. Doublet of overmickle. Cognate with Scots over-mekill (“overmuch, excessive”), Old Norse ofrmikill (“overmuch, excessive”), Icelandic ofmikill (“overmuch, excessive”).

Etymology from Wiktionary, CC BY-SA 3.0