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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Enabling modes
Date: Sat, 09 Sep 2017 20:50:06 +0300
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> From: Robert Thorpe <rt@robertthorpeconsulting.com>
> Date: Sat, 09 Sep 2017 18:12:18 +0100
> 
> Usually modes are set up the other way around, by including things.
> Mode X is triggered for languages Y and Z, for example.  I want it the
> opposite way around, I want visual-line-mode to be always enabled unless
> I have a tab-separated-value file.
> 
> Is that possible?

Did you try to do this in the mode hook?