Declension table of ?siṣīvvas

Neuter	Singular	Dual	Plural
Nominative	siṣīvvat	siṣīvuṣī	siṣīvvāṃsi
Vocative	siṣīvvat	siṣīvuṣī	siṣīvvāṃsi
Accusative	siṣīvvat	siṣīvuṣī	siṣīvvāṃsi
Instrumental	siṣīvuṣā	siṣīvvadbhyām	siṣīvvadbhiḥ
Dative	siṣīvuṣe	siṣīvvadbhyām	siṣīvvadbhyaḥ
Ablative	siṣīvuṣaḥ	siṣīvvadbhyām	siṣīvvadbhyaḥ
Genitive	siṣīvuṣaḥ	siṣīvuṣoḥ	siṣīvuṣām
Locative	siṣīvuṣi	siṣīvuṣoḥ	siṣīvvatsu

Compound siṣīvvat -

Adverb -siṣīvvat