Declension table of ?kaṣṭārtha

Neuter	Singular	Dual	Plural
Nominative	kaṣṭārtham	kaṣṭārthe	kaṣṭārthāni
Vocative	kaṣṭārtha	kaṣṭārthe	kaṣṭārthāni
Accusative	kaṣṭārtham	kaṣṭārthe	kaṣṭārthāni
Instrumental	kaṣṭārthena	kaṣṭārthābhyām	kaṣṭārthaiḥ
Dative	kaṣṭārthāya	kaṣṭārthābhyām	kaṣṭārthebhyaḥ
Ablative	kaṣṭārthāt	kaṣṭārthābhyām	kaṣṭārthebhyaḥ
Genitive	kaṣṭārthasya	kaṣṭārthayoḥ	kaṣṭārthānām
Locative	kaṣṭārthe	kaṣṭārthayoḥ	kaṣṭārtheṣu

Compound kaṣṭārtha -

Adverb -kaṣṭārtham -kaṣṭārthāt