There are 9 14-letter words that end with 'tness'.
| benevolentness | forthrightness |
| fraudulentness | indiscreetness |
| indistinctness | intolerantness |
| roundaboutness | unpleasantness |
| watertightness | |
Note: These 9 14-letter words that end with 'tness' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with ntness, ctness, rtness, stness, htness, itness, etness, ptness, atness, ftness, utness, ltness, otness.
7-letter words end with 'tness' (7)