Declension table of ?gambhīraka

Neuter	Singular	Dual	Plural
Nominative	gambhīrakam	gambhīrake	gambhīrakāṇi
Vocative	gambhīraka	gambhīrake	gambhīrakāṇi
Accusative	gambhīrakam	gambhīrake	gambhīrakāṇi
Instrumental	gambhīrakeṇa	gambhīrakābhyām	gambhīrakaiḥ
Dative	gambhīrakāya	gambhīrakābhyām	gambhīrakebhyaḥ
Ablative	gambhīrakāt	gambhīrakābhyām	gambhīrakebhyaḥ
Genitive	gambhīrakasya	gambhīrakayoḥ	gambhīrakāṇām
Locative	gambhīrake	gambhīrakayoḥ	gambhīrakeṣu

Compound gambhīraka -

Adverb -gambhīrakam -gambhīrakāt