There are 14 10-letter words that end with 'lness'.
| artfulness | casualness | dismalness |
| manfulness | lawfulness | formalness |
| fitfulness | joyfulness | ruefulness |
| shrillness | sinfulness | usefulness |
| venialness | woefulness | |
Note: These 14 10-letter words that end with 'lness' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with ulness, alness, llness, ilness, elness, olness.
7-letter words end with 'lness' (3)