Declension table of ?siṣṇu

Masculine	Singular	Dual	Plural
Nominative	siṣṇuḥ	siṣṇū	siṣṇavaḥ
Vocative	siṣṇo	siṣṇū	siṣṇavaḥ
Accusative	siṣṇum	siṣṇū	siṣṇūn
Instrumental	siṣṇunā	siṣṇubhyām	siṣṇubhiḥ
Dative	siṣṇave	siṣṇubhyām	siṣṇubhyaḥ
Ablative	siṣṇoḥ	siṣṇubhyām	siṣṇubhyaḥ
Genitive	siṣṇoḥ	siṣṇvoḥ	siṣṇūnām
Locative	siṣṇau	siṣṇvoḥ	siṣṇuṣu

Compound siṣṇu -

Adverb -siṣṇu