(1) 'No self-nature' (niḥsvabhāvatva, niḥsvabhāva). (2) That which does not really exist; non-existence; lacking real substance. (3) The lack of inherent existence that could be attached to: emptiness. (4) Lacking buddha-nature. A being who cannot be enlightened no matter how much they strive. (5) *Asvabhāva, an Indian Yogācāra scholar who wrote a commentary on the Mahāyāna-saṃgrāha (攝大乘論無性釋).

Without a nature, nothing has an independent nature of its own; cf. 三無性.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous

asvabhāva, niḥsvabhāva; agotraka; nāstitā; animitta, aprapañcatā, abhāva, abhāva-svabhāva, alakṣaṇa, alabdhātmaka, asad-artha, asad-bhāva, nāstitva, niḥsvabhāvatā, niḥsvabhāvatva, śūnya.

佛教漢梵大辭典

P2153

謂四大乃至涅槃等假名，畢竟空中一切悉無，是名無性。

明，一如《三藏法數》字庫