וַיֹּאמְר֣וּ אֲלֵיהֶ֗ם לֹ֤א נוּכַל֙ לַעֲשׂוֹת֙ הַדָּבָ֣ר הַזֶּ֔ה לָתֵת֙ אֶת־אֲחֹתֵ֔נוּ לְאִ֖ישׁ אֲשֶׁר־ל֣וֹ עָרְלָ֑ה כִּֽי־חֶרְפָּ֥ה הִ֖וא לָֽנוּ׃
對他們說：«我們不能做這事，把我們的妹妹給沒有受割禮的人，因為那是我們的恥辱。»
Rashi
חרפה הוא THAT WERE A DISGRACE — Amongst us it is somewhat of a blot on our pedigree, for if one wishes to revile another, he says to him: “You are an uncircumcised person”, or “the son of an uncircumcised person”. The word חרפה always means “reviling”.
Radak
ויאמרו ...כי חרפה היא לנו, to be intermarried with the uncircumcised, seeing that our males are all circumcised.
Sforno
כי חרפה היא לנו, it would appear that none of the circumcised men among us were fit to marry our sister.