Declension table of ?dīrghaprayatna

Masculine	Singular	Dual	Plural
Nominative	dīrghaprayatnaḥ	dīrghaprayatnau	dīrghaprayatnāḥ
Vocative	dīrghaprayatna	dīrghaprayatnau	dīrghaprayatnāḥ
Accusative	dīrghaprayatnam	dīrghaprayatnau	dīrghaprayatnān
Instrumental	dīrghaprayatnena	dīrghaprayatnābhyām	dīrghaprayatnaiḥ dīrghaprayatnebhiḥ
Dative	dīrghaprayatnāya	dīrghaprayatnābhyām	dīrghaprayatnebhyaḥ
Ablative	dīrghaprayatnāt	dīrghaprayatnābhyām	dīrghaprayatnebhyaḥ
Genitive	dīrghaprayatnasya	dīrghaprayatnayoḥ	dīrghaprayatnānām
Locative	dīrghaprayatne	dīrghaprayatnayoḥ	dīrghaprayatneṣu

Compound dīrghaprayatna -

Adverb -dīrghaprayatnam -dīrghaprayatnāt