scintilla

1. QUANT If you say that there is not a scintilla of evidence, hope, or doubt about something, you are emphasizing that there is none at all. 一点[文学性] [with brd-neg, QUANT 'of' n-uncount]

He says there is "not a scintilla of evidence" to link him to any controversy. 他说“没有丝毫证据”能将他与任何争议联系起来。