Beekes tentatively takes the word as a cross of εἶθᾰρ (eîthar, “at once, immediately”) + ῑ̓θῠ́ς (īthús).[1] For ῑ̓θῠ́ς (īthús), Beekes implicitly prefers Willi's derivation from Proto-Indo-European *Hyewdʰ-dh-ú from the root *Hyewdʰ- (“moving erect”), with original basic meaning "to make right".[2] The Ionic form is from a dissimilated *εἰθύς (*eithús).
εὐθῠ́ς • (euthús) m (feminine εὐθεῖᾰ, neuter εὐθῠ́); first/third declension
Number | Singular | Dual | Plural | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Case/Gender | Masculine | Feminine | Neuter | Masculine | Feminine | Neuter | Masculine | Feminine | Neuter | |||||
Nominative | εὐθῠ́ς euthús |
εὐθεῖᾰ eutheîa |
εὐθῠ́ euthú |
εὐθέε euthée |
εὐθείᾱ eutheíā |
εὐθέε euthée |
εὐθεῖς eutheîs |
εὐθεῖαι eutheîai |
εὐθέᾰ euthéa | |||||
Genitive | εὐθέος euthéos |
εὐθείᾱς eutheíās |
εὐθέος euthéos |
εὐθέοιν euthéoin |
εὐθείαιν eutheíain |
εὐθέοιν euthéoin |
εὐθέων euthéōn |
εὐθειῶν eutheiôn |
εὐθέων euthéōn | |||||
Dative | εὐθεῖ eutheî |
εὐθείᾳ eutheíāi |
εὐθεῖ eutheî |
εὐθέοιν euthéoin |
εὐθείαιν eutheíain |
εὐθέοιν euthéoin |
εὐθέσῐ / εὐθέσῐν euthési(n) |
εὐθείαις eutheíais |
εὐθέσῐ / εὐθέσῐν euthési(n) | |||||
Accusative | εὐθῠ́ν euthún |
εὐθεῖᾰν eutheîan |
εὐθῠ́ euthú |
εὐθέε euthée |
εὐθείᾱ eutheíā |
εὐθέε euthée |
εὐθεῖς eutheîs |
εὐθείᾱς eutheíās |
εὐθέᾰ euthéa | |||||
Vocative | εὐθῠ́ euthú |
εὐθεῖᾰ eutheîa |
εὐθῠ́ euthú |
εὐθέε euthée |
εὐθείᾱ eutheíā |
εὐθέε euthée |
εὐθεῖς eutheîs |
εὐθεῖαι eutheîai |
εὐθέᾰ euthéa | |||||
Derived forms | Adverb | Comparative | Superlative | |||||||||||
εὐθέως euthéōs |
εὐθῠ́τερος euthúteros |
εὐθῠ́τᾰτος euthútatos | ||||||||||||
Notes: |
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εὐθῠ́ς • (euthús)
In adverbial usage, typically the masculine form (εὐθῠ́ς (euthús)) is used for time, while the neuter (εὐθῠ́ (euthú)) is used for place.