unsubstantiated

US /ˌʌn.səbˈstæn.ʃi.eɪ.t̬ɪd/
UK /ˌʌn.səbˈstæn.ʃi.eɪ.t̬ɪd/
1.

ไม่พร้อมเพรียง

not supported by facts:

:
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Companies can be punished for making unsubstantiated claims about their products.