untrilled

Thus 21 was often used for a weak (untrilled) r, originally occurring in Quenya and regarded in the system of that language as the weakest consonant of the tincotéma; 22 was widely used for w; where Series III was used as a palatal series 23 was commonly used as consonantal y.

The Lord of the Rings Tolkien, J. R. R. 1954

Otherwise situated, it has a smooth or untrilled sound, as in hare, carve, abhor.

The Standard Speller; Containing Exercises for Oral Spelling; also, Sentences for Silent Spelling by Writing from Dictation. In Which the Representative Words and the Anomalous Words of the English Language are so Classified as to Indicate Their Pronunciation, and to be Fixed in the Memory by Association. 1861