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δεινός (deinos): all forms

δεινός means “terrible, fearful; clever, formidable”. Below is its full declension in Ancient Greek.

Positive

Positive, singular
MasculineFeminineNeuterForms
Nominativeδεινόςδεινήδεινόν
Genitiveδεινοῦδεινῆςδεινοῦ
Dativeδεινῷδεινῇδεινῷ
Accusativeδεινόνδεινήνδεινόν
Vocativeδεινέδεινήδεινόν
Positive, plural
MasculineFeminineNeuterForms
Nominativeδεινοίδειναίδεινά
Genitiveδεινῶνδεινῶνδεινῶν
Dativeδεινοῖςδειναῖςδεινοῖς
Accusativeδεινούςδεινάςδεινά
Vocativeδεινοίδειναίδεινά
Positive, forms
MasculineFeminineNeuterForms
Formsδεινῶς

Comparative

Comparative, singular
MasculineFeminineNeuterForms
Nominativeδεινότεροςδεινοτέραδεινότερον
Genitiveδεινοτέρουδεινοτέραςδεινοτέρου
Dativeδεινοτέρῳδεινοτέρᾳδεινοτέρῳ
Accusativeδεινότερονδεινοτέρανδεινότερον
Vocativeδεινότερεδεινοτέραδεινότερον
Comparative, plural
MasculineFeminineNeuterForms
Nominativeδεινότεροιδεινότεραιδεινότερα
Genitiveδεινοτέρωνδεινοτέρωνδεινοτέρων
Dativeδεινοτέροιςδεινοτέραις · δεινοτέραφι · δεινοτέρᾳςδεινοτέροις
Accusativeδεινοτέρουςδεινοτέραςδεινότερα
Vocativeδεινότεροιδεινότεραιδεινότερα
Comparative, forms
MasculineFeminineNeuterForms
Formsδεινότερον

Superlative

Superlative, singular
MasculineFeminineNeuterForms
Nominativeδεινότατοςδεινοτάτηδεινότατον
Genitiveδεινοτάτουδεινοτάτηςδεινοτάτου
Dativeδεινοτάτῳδεινοτάτῃδεινοτάτῳ
Accusativeδεινότατονδεινοτάτηνδεινότατον
Vocativeδεινότατεδεινοτάτηδεινότατον
Superlative, plural
MasculineFeminineNeuterForms
Nominativeδεινότατοιδεινόταταιδεινότατα
Genitiveδεινοτάτωνδεινοτάτωνδεινοτάτων
Dativeδεινοτάτοιςδεινοτάταιςδεινοτάτοις
Accusativeδεινοτάτουςδεινοτάταςδεινότατα
Vocativeδεινότατοιδεινόταταιδεινότατα
Superlative, forms
MasculineFeminineNeuterForms
Formsδεινότατα

Meaning and examples of δεινός

Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Liddell-Scott-Jones, A Greek-English Lexicon (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.