Lexical Definition

‎συνήδομαι‎ synḗdomai (soon-ay'-dom-ahee) to delight ^G:V
middle voice from ‎σύν‎ and the base of ‎ἡδονή‎

delight.

• to rejoice in with oneself, i.e. feel satisfaction concerning

Abbott-Smith

* συν-ήδομαι
to rejoice together; c. dat., to rejoice with or in: τ. νόμῳ τ. θεοῦ, Ro 7:22 (v. Lft., Notes, 304).†

Abbott-Smith References

Liddell-Scott-Jones

συνήδομαι,

future -ησθήσομαι[Refs 5th c.BC+]: aorist -ήσθην[Refs 5th c.BC+]:—rejoice together, Pl.[same place], [Refs 5th c.BC+]; σ. τινί rejoice with, sympathize with, [Refs 5th c.BC+]; opposed to συλλυπεῖσθαι, [Refs 5th c.BC+]; opposed to συνάχθεσθαι, [Refs 5th c.BC+]; opposed to συναλγεῖν,[Refs 5th c.BC+]

__2 with dative of things, rejoice at a thing, σ. τοῖς ἀγαθοῖς [NT+5th c.BC+]; τινος because of.. , [Refs 2nd c.AD+]
__3 with dative person et of things, [Refs 5th c.BC+]
__II sometimes used like{ἐφήδομαι} of malicious joy at misfortune, οὐδὲ συνήδομαι.. ἄλγεσιν δώματος [Refs 5th c.BC+]; τί τάλας τοῖσδε συνήδῃ..; [Refs]; θανόντι γ᾽ οὐδαμῶς σ. [Refs]; συνηδόμενοι ταῖς συμφοραῖς restored from [Refs 5th c.BC+]

_{LSJ Scripture Refs: Rom.7.22}