Definition of "nameless"

Minute grew into minute, and still there was no sign of life, nor did the curtain move; but I felt the gaze of the unknown being sinking through and through me, and filling me with a nameless terror, till the perspiration stood in beads upon my brow.

1886 October – 1887 January, H[enry] Rider Haggard, “The Plain of Kôr”, in She: A History of Adventure, London: Longmans, Green, and Co., published 1887, page 126

He said that he would cherish her until the grave, and that he would love her nameless son as though he were his own flesh.

1953, James Baldwin, “Elizabeth’s Prayer”, in Go Tell It on the Mountain, New York, N.Y.: Dell Publishing Co., published October 1970, part 2 (The Prayers of the Saints), page 175

Hérison, m. The female pudendum; ‘the nameless’.

1896, John Stephen Farmer, “Hérison”, in Vocabula Amatoria, page 156