LSJ
one must talk against, cj. in Thom.Mag. p. 224R. (who censures it).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
TBESG
one must talk against (MT)
Translators Brief lexicon of Extended Strongs for Greek based on Abbot-Smith, A Manual Greek Lexicon of the New Testament (1922) (=AS), with corrections and adapted by Tyndale Scholars