Declension table of ?dṛḍhapattra

Masculine	Singular	Dual	Plural
Nominative	dṛḍhapattraḥ	dṛḍhapattrau	dṛḍhapattrāḥ
Vocative	dṛḍhapattra	dṛḍhapattrau	dṛḍhapattrāḥ
Accusative	dṛḍhapattram	dṛḍhapattrau	dṛḍhapattrān
Instrumental	dṛḍhapattreṇa	dṛḍhapattrābhyām	dṛḍhapattraiḥ dṛḍhapattrebhiḥ
Dative	dṛḍhapattrāya	dṛḍhapattrābhyām	dṛḍhapattrebhyaḥ
Ablative	dṛḍhapattrāt	dṛḍhapattrābhyām	dṛḍhapattrebhyaḥ
Genitive	dṛḍhapattrasya	dṛḍhapattrayoḥ	dṛḍhapattrāṇām
Locative	dṛḍhapattre	dṛḍhapattrayoḥ	dṛḍhapattreṣu

Compound dṛḍhapattra -

Adverb -dṛḍhapattram -dṛḍhapattrāt