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 अक्र
अक्रakraa.(Ved.) [अञ्च् गतौ-रक्]
(Vedic) अञ्च् गतौ-रक्
Inactive, steady, firm (स्थिर).
Bootless, profitless.
Derived forms and compounds
-क्रः A fortification or rampart (प्रकार); banner (?); Nir.6.17.