Declension table of ?śamastha

Neuter	Singular	Dual	Plural
Nominative	śamastham	śamasthe	śamasthāni
Vocative	śamastha	śamasthe	śamasthāni
Accusative	śamastham	śamasthe	śamasthāni
Instrumental	śamasthena	śamasthābhyām	śamasthaiḥ
Dative	śamasthāya	śamasthābhyām	śamasthebhyaḥ
Ablative	śamasthāt	śamasthābhyām	śamasthebhyaḥ
Genitive	śamasthasya	śamasthayoḥ	śamasthānām
Locative	śamasthe	śamasthayoḥ	śamastheṣu

Compound śamastha -

Adverb -śamastham -śamasthāt