NET
29 As the crowds were increasing, Jesus began to say, “This generation is a wicked generation; it looks for a sign, but no sign will be given to it except the sign of Jonah.
Darby
29 But as the crowds thronged together, he began to say, This generation is a wicked generation: it seeks a sign, and a sign shall not be given to it but the sign of Jonas.
KJV
29 And when the people were gathered thick together, he began to say, “This is an evil generation: they seek a sign; and there shall no sign be given it, but the sign of Jonas the prophet.”