/SLASHPLAY
How to unbind a key in TF2
Type unbind f in your game console to remove the bind from F. The key does nothing until you bind it again.
unbind
Removes the bind from one key.
unbind <key> Examples
unbind f Clear the F key.
Arguments
keyRequired- Key name.
What it does
The key stops doing anything until you bind it again.
The game's own description: Unbind a key.
Run it on your server
On a SLASHPLAY server, type it in the Console tab of the server page; the reply shows right under it. A value set there lasts until the server restarts. To keep it, add the line to tf/cfg/server.cfg. New to this? Start a TF2 server first.
Your own
TF2 server.
From $0.03 an hour, only while it runs. New accounts get 6 free tokens.