अयत्नात्ayatnātind. (or in comp. अयत्न-) without effort or exertion.
indeclinable (or in compound अयत्न-) without effort or exertion.
कोशःDictionaries
Every entry for a word in Apte, Monier-Williams, Macdonell and the Dhātupāṭha, with their abbreviations spelled out, and an analysis of its forms.