accusative singular neuter of sukhumā, adjective
Etymology. su- (well, good) + √hum (to cover, conceal — a rare root sense). The word builds on the notion of 'well-concealed' or 'finely drawn.' Cognate: English 'hum' (soft murmur). The prefix su- (English 'good,' Greek eu-) shifts the meaning toward positive qualities: that which is finely wrought, delicate, imperceptible to coarse perception.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
Lite mode — plain HTML for e-readers and old browsers. Full version