'Adulterous' in the Bible

"So is the way of an adulterous woman: she eats and wipes her mouth, and says, 'I have done nothing wrong.'

But he answered them, "An evil and adulterous generation seeks after a sign, but no sign will be given it but the sign of Jonah the prophet.

An evil and adulterous generation seeks after a sign, and there will be no sign given to it, except the sign of the prophet Jonah." He left them, and departed.

For whoever will be ashamed of me and of my words in this adulterous and sinful generation, the Son of Man also will be ashamed of him, when he comes in the glory of his Father with the holy angels."