There are 12 words that start with 'undes'.
| undesired | undeserved |
| undescended | undeserving |
| undesigning | undesirable |
| undesirably | undesignated |
| undesirables | undescribable |
| undesirability | undesirableness |
Note: These 12 words that start with 'undes' are found from the USA & Canada version of the tournament Scrabble word list.