V. S. Apte, The Practical Sanskrit–English Dictionary. Look up any word of the Gita in Devanagari, IAST or Harvard-Kyoto, or browse the headwords letter by letter.
Entry अनिश
अनिशaniśaa.Ved.
Vedic
Nightless, id est, that isuninterrupted, incessant (निशा तद्धेतुकत्वेनोपचारात् चेष्टाविनाशः सा नास्ति यस्य).
Ever afraid.
Derived forms and compounds
-शम्Indeclinable Incessantly, ceaselessly; अनिशमपि मकरकेतुर्मनसो रुजमावहन्नभिमतो मे Ś.3,4; Bv.2.162.