| Singular | Dual | Plural |
| Nominative |
कठिनहृदयम्
kaṭhinahṛdayam
|
कठिनहृदये
kaṭhinahṛdaye
|
कठिनहृदयानि
kaṭhinahṛdayāni
|
| Vocative |
कठिनहृदय
kaṭhinahṛdaya
|
कठिनहृदये
kaṭhinahṛdaye
|
कठिनहृदयानि
kaṭhinahṛdayāni
|
| Accusative |
कठिनहृदयम्
kaṭhinahṛdayam
|
कठिनहृदये
kaṭhinahṛdaye
|
कठिनहृदयानि
kaṭhinahṛdayāni
|
| Instrumental |
कठिनहृदयेन
kaṭhinahṛdayena
|
कठिनहृदयाभ्याम्
kaṭhinahṛdayābhyām
|
कठिनहृदयैः
kaṭhinahṛdayaiḥ
|
| Dative |
कठिनहृदयाय
kaṭhinahṛdayāya
|
कठिनहृदयाभ्याम्
kaṭhinahṛdayābhyām
|
कठिनहृदयेभ्यः
kaṭhinahṛdayebhyaḥ
|
| Ablative |
कठिनहृदयात्
kaṭhinahṛdayāt
|
कठिनहृदयाभ्याम्
kaṭhinahṛdayābhyām
|
कठिनहृदयेभ्यः
kaṭhinahṛdayebhyaḥ
|
| Genitive |
कठिनहृदयस्य
kaṭhinahṛdayasya
|
कठिनहृदययोः
kaṭhinahṛdayayoḥ
|
कठिनहृदयानाम्
kaṭhinahṛdayānām
|
| Locative |
कठिनहृदये
kaṭhinahṛdaye
|
कठिनहृदययोः
kaṭhinahṛdayayoḥ
|
कठिनहृदयेषु
kaṭhinahṛdayeṣu
|