Greek core word #262 · adjective · 59 times in the New Testament

εὐθύς

ew-THOOS

εὐθύς, εὐθεῖα, εὐθύ — straight; immediately

Third/first declension adjective in -υς, -εια, -υ (like βαρύς, ὀξύς): stem εὐθε- in most masc./neut. forms, fem. εὐθεῖα, εὐθείας.
The masculine εὐθύς is used as an adverb “immediately” about 50 times (above all in Mark); MorphGNT parses it as an adjective.
The adverb εὐθέως has the same meaning.

Forms in bold occur in the New Testament; the others complete the pattern. A dash (—) marks a form that does not exist.

	Masc. sg	Fem. sg	Neut. sg	Masc. pl	Fem. pl	Neut. pl
Nom	εὐθύς	εὐθεῖα	εὐθύ	εὐθεῖς	εὐθεῖαι	εὐθέα
Gen	εὐθέος	εὐθείας	εὐθέος	εὐθέων	εὐθειῶν	εὐθέων
Dat	εὐθεῖ	εὐθείᾳ	εὐθεῖ	εὐθέσι(ν)	εὐθείαις	εὐθέσι(ν)
Acc	εὐθύν	εὐθεῖαν	εὐθύ	εὐθεῖς	εὐθείας	εὐθέα
Voc	εὐθύ	εὐθεῖα	εὐθύ	εὐθεῖς	εὐθεῖαι	εὐθέα

Where you meet it

First met in passage 9, Mark 1:29.

Explained in the notes of 4 passages: