Declension table of ?astena

Masculine	Singular	Dual	Plural
Nominative	astenaḥ	astenau	astenāḥ
Vocative	astena	astenau	astenāḥ
Accusative	astenam	astenau	astenān
Instrumental	astenena	astenābhyām	astenaiḥ astenebhiḥ
Dative	astenāya	astenābhyām	astenebhyaḥ
Ablative	astenāt	astenābhyām	astenebhyaḥ
Genitive	astenasya	astenayoḥ	astenānām
Locative	astene	astenayoḥ	asteneṣu

Compound astena -

Adverb -astenam -astenāt