Declension table of ?kāṭhya

Neuter	Singular	Dual	Plural
Nominative	kāṭhyam	kāṭhye	kāṭhyāni
Vocative	kāṭhya	kāṭhye	kāṭhyāni
Accusative	kāṭhyam	kāṭhye	kāṭhyāni
Instrumental	kāṭhyena	kāṭhyābhyām	kāṭhyaiḥ
Dative	kāṭhyāya	kāṭhyābhyām	kāṭhyebhyaḥ
Ablative	kāṭhyāt	kāṭhyābhyām	kāṭhyebhyaḥ
Genitive	kāṭhyasya	kāṭhyayoḥ	kāṭhyānām
Locative	kāṭhye	kāṭhyayoḥ	kāṭhyeṣu

Compound kāṭhya -

Adverb -kāṭhyam -kāṭhyāt