The Quran

قالوا يا شُعَيبُ ما نَفقَهُ كَثيرًا مِمّا تَقولُ وَإِنّا لَنَراكَ فينا ضَعيفًا ۖ وَلَولا رَهطُكَ لَرَجَمناكَ ۖ وَما أَنتَ عَلَينا بِعَزيزٍ

Muhammad Asad

[But his people] said: "O Shu'ayb! We cannot grasp the purport of much of what thou sayest;¹ on the other hand, behold, we do see clearly how weak thou art in our midst:² and were it not for thy family, we would have most certainly stoned thee to death, considering that thou hast no power over us!"

Cf. 6:25. In the present instance. however, the self-confessed lack of understanding on the part of the people of Madyan may have a more subjective meaning, similar to the half-indignant, half-embarrassed retort. "I don't know what you are talking about."
Lit., "we regard thee indeed as a weak one among us" - i.e., without any appreciable tribal support.