Credit goes to xnor for finding the main part of this, but:

the adjacent numbers contain TWO consecutive numbers spelled out:
Furthermore -> Three, Four
Overharvesting -> Nine, Ten
Shortening -> Eight, Nine
Worksheet -> Two, Three
Ancient -> Nine, Ten
Unfroze -> Zero, One
Expansive -> Six, Seven
Preventable -> Ten, Eleven
Unforgivable -> Four, Five
Townhouse -> One, Two
Reflexives -> Six, Seven

Credit goes to xnor for finding the main part of this, but:

the adjacent numbers contain TWO consecutive numbers spelled out:
Furthermore -> Three, Four
Overharvesting -> Seven, Eight
Shortening -> Eight, Nine
Worksheet -> Two, Three
Ancient -> Nine, Ten
Unfroze -> Zero, One
Expansive -> Six, Seven
Preventable -> Ten, Eleven
Unforgivable -> Four, Five
Townhouse -> One, Two
Reflexives -> Five, Six