clinchingly

adv

1. in a clinching manner, in a manner which serves to clinch something

   “She waited, till with quickened breath She spoke, as one who banisheth Reserves that lovecraft heeds so well, To ease some mighty wish to tell: “’Twas I,” said she, “Who wrote thus clinchingly.”

   ““I wouldn't be at all surprised if he drank a lot,” said Lady Partridge, with a hint of solidarity. ¶ “And then, of course,” said Nick clinchingly, but with a sad loll of the head, “he jumped off a bridge into the Mississippi.””

   “These circumstances are clinchingly against the appellant.”