I would say 9s may appear to be externally wimpy (and I am a 9). So since the OP said "externally", I guess 9s have my vote.
But also, to defend myself and my fellow 9s, it's not that we always really are wimpy (though we can be), it's just that I have a high tolerance for things. Peace/No drama/conflict has a high value for me. But if something or someone really steps on my boundaries, you'll be sure they'll hear of it -- and may be a little more careful next time.