1) Admonish 2) Caution 3) Censure 4) Chide 5) Criticise 6) Criticize 7) Dress down 8) French word used in English 9) Give a warning 10) Knock 11) Pick apart 12) Rebuke 13) Reprimand 14) Reproach 15) Scold 16) Take to task 17) Tell off 18) Warn about Found on https://www.crosswordclues.com/clue/reprove
• (v. t.) To express disapprobation of; as, to reprove faults. • (v. t.) To disprove; to refute. • (v. t.) To chide to the face as blameworthy; to accuse as guilty; to censure. • (v. t.) To convince. Found on http://thinkexist.com/dictionary/meaning/reprove/
Re·prove' transitive verb [ imperfect & past participle Reproved (-pr??vd'); present participle & verbal noun Reproving .] [ French réprouver , Old French reprover , from Latin reprobare . See Reprieve , Found on http://www.encyclo.co.uk/webster/R/56