english - Longest Word without repeating character-pairs

What's the longest English word that doesn't contain the same two letters in a row more than once?

Good word : too contains to once and oo once.

Good word : tot contains to once and ot once.

Bad word : aardvark contains most pairs once but ar appears twice.

Handy JavaScript test function :

function test_word(w){
    for(var l=[],i=1; i        var p=w[i-1]+w[i];
        if( l[p] ) return p;
        l[p]=true;
    }
    return true;
}

To test your word read the link above then copy and paste the test function hit enter then use the command:

test_word('yourword');

It will return true if it is good and the repeated characters otherwise.

You can also check the word in Excel by entering the word into the cell A1 and entering this formula elsewhere as an array formula using Ctrl+Shift+Enter: (It will return TRUE if it is good and FALSE if it is not.)

=MAX(LEN($A$1)-LEN(SUBSTITUTE(UPPER($A$1),MID(UPPER($A$1),ROW(OFFSET($A$1,0,0,LEN($A$1)-1)),2),"")))<=2