Meaning

noun that which is below standard or expectations as of ethics or decency

adjective having undesirable or negative qualities

adjective very intense

originFrom Middle English bad, badde (“wicked, evil, depraved”), of uncertain origin. Perhaps a shortening of Old English bæddel (“hermaphrodite”) (for loss of -el compare Middle English muche from Old English myċel, and Middle English wenche from Old English wenċel), or at least related to it and/or to bǣ̆dan (“to defile”), compare Old High German pad (“hermaphrodite”). Alternatively, perhaps a loan…

Etymology from Wiktionary, CC BY-SA 3.0