Forthwith - Vine's Expository Dictionary of New Testament Words
Forthwith
[ 1,,G1824, exautes ]at once" (from, ek, "out of," and autes, the genitive case of autos, "self or very," agreeing with "hour" understood, i.e., "from that very hour"), is translated "forthwith" in the RV in Mark 6:25 (AV, "by and by"); Acts 10:33 (AV, "immediately"); Acts 11:11 (ditto); Acts 21:32 (ditto); Acts 23:30 (AV, "straightway"); Philippians 2:23 (AV, "presently"). The word is frequent in the period of the koine Greek (See Preface). See IMMEDIATELY, PRESENTLY, STRAIGHTWAY.
[ 2,,G2112, eutheos ]
"at once, straightway" (from the adjective, euthus, "straight"), is translated "forthwith," in the AV of Matthew 13:5; Matthew 26:49; (it occurs in some mss. in Mark 5:13; the RV omits it); Acts 12:10; Acts 21:30 (RV, "straightway," in each place). See IMMEDIATELY, SHORTLY, STRAIGHTWAY.
[ 3,,G2117, euthus ]
an alternative adverb to No. 2, is translated "forthwith" in the AV of Mark 1:29; Mark 1:43 (in the best mss.), and John 19:34 (RV, "straightway"). See ANON, IMMEDIATELY, STRAIGHTWAY. Note: Parachrema, a synonymous word denoting "instantly, on the spot," is not translated "forthwith" in AV or RV. See IMMEDIATELY.