monoglot's Usage Examples:

It was also particularly stated that all legal procedure must henceforth be conducted in the English tongue, an arrangement which fell very heavily on poor monoglot Welshmen and appears an especially harsh and ungracious enactment when coming from a sovereign who was himself a genuine Welshman by birth.

monoglot speaker of old Cornish?

Nor is the question of the vernacular itself of necessity bound up with this new movement, for Wales is essentially a bi-lingual country, wherein every educated Cymro speaks and writes English with ease, and where also large towns and whole districts - such as Cardiff, south Monmouth, the Vale of Glamorgan, Gower, south Glamorgan, south Pembroke, east Flint, Radnorshire and Breconshire - remain practically monoglot English-speaking.