'Adulterous' in the Bible

But he replied to them, "An evil and adulterous generation craves a sign. Yet no sign will be given to it except the sign of the prophet Jonah,

You know how to interpret the appearance of the sky, yet you can't interpret the signs of the times? An evil and adulterous generation craves a sign, but no sign will be given to it except the sign of Jonah." Then he left them and went away.

If anyone is ashamed of me and my words in this adulterous and sinful generation, the Son of Man will be ashamed of him when he comes with the holy angels in his Father's glory."