Persistent

not easily to be degraded. This term is used in classification of chemicals.

a 1. узбекскийsabotli, matonatli, qattiq, yoʻlidan qaytmaydiganрусскийнастойчивый, упорный

2. узбекскийchidamli, pishiq, barqaror, mustahkam, doimiyрусскийстойкий, устойчивый, постоянный