Lexical Definition

‎ἀσύμφωνος‎ asýmphōnos (as-oom'-fo-nos) discordant ^G:A
from ‎Α‎ (as a negative particle) and ‎σύμφωνος‎

agree not.

• inharmonious (figuratively)

Abbott-Smith

** ἀ-σύμφωνος, -ον, [in LXX: Wi 18:10, Da, LXX, Bel 15*;]
dissonant, discordant; metaph., at variance: πρὸς ἀλλήλους, Ac 28:25.†

Abbott-Smith References

Liddell-Scott-Jones

ἀσύμφωνος-ος,

Attic dialect ἀξ-, ον, not harmonious, [Refs 5th c.BC+]

__2 metaphorically, discordant, at variance, ἐμαυτῷ[NT+5th c.BC+]. adverb -νως[Refs 5th c.BC+]; τοῖς αὐτοῖς argument Str.I.
__II not speaking the same language, πρὸς ἄλληλα[Refs 5th c.BC+]

_{LSJ Scripture Refs: Acts.28.25}