apramāṇa: Immeasurable. There are four: maitrī, karuṇā, muditā, upekṣā.

Sarvastivada Abhidharma, Sanskrit-English Glossary, by Bhikkhu KL Dhammajoti

a-pramāṇa n. a rule which is no standard of action MBh. Śāk. &c
• (in discussion) a statement of no importance or authority

Sanskrit-English Dictionary, by M. Monier William