a. (UN-1 7 b.)

1

  In frequent use from c. 1895.

2

1882.  Ch. Times, XX. 21. I fear to find myself with a[n] … unlettable glebe on my hands.

3

1893.  Dk. Argyll, Unseen Found. Soc., x. 305. Farms which have been unlettable.

4