Declension table of ?dṛḍhakaṇṭaka

Masculine	Singular	Dual	Plural
Nominative	dṛḍhakaṇṭakaḥ	dṛḍhakaṇṭakau	dṛḍhakaṇṭakāḥ
Vocative	dṛḍhakaṇṭaka	dṛḍhakaṇṭakau	dṛḍhakaṇṭakāḥ
Accusative	dṛḍhakaṇṭakam	dṛḍhakaṇṭakau	dṛḍhakaṇṭakān
Instrumental	dṛḍhakaṇṭakena	dṛḍhakaṇṭakābhyām	dṛḍhakaṇṭakaiḥ dṛḍhakaṇṭakebhiḥ
Dative	dṛḍhakaṇṭakāya	dṛḍhakaṇṭakābhyām	dṛḍhakaṇṭakebhyaḥ
Ablative	dṛḍhakaṇṭakāt	dṛḍhakaṇṭakābhyām	dṛḍhakaṇṭakebhyaḥ
Genitive	dṛḍhakaṇṭakasya	dṛḍhakaṇṭakayoḥ	dṛḍhakaṇṭakānām
Locative	dṛḍhakaṇṭake	dṛḍhakaṇṭakayoḥ	dṛḍhakaṇṭakeṣu

Compound dṛḍhakaṇṭaka -

Adverb -dṛḍhakaṇṭakam -dṛḍhakaṇṭakāt