Romans 12:9 — Let love be without dissimulation. Abhor that which is evil; cleave to that which is good.
dissimulation (hypocrasy) — A hypocrite was a stage actor who played a part that wasn't his real character.
abhor/cling — strong, direct opposites, referring to love. Be discerning.
abhor = hate
Verses 3-8 were about Christian service. Verses 9-21 are about Christian conduct.
Hate what God hates and love what God loves.
love — agape, the love between an husband and wife.
2 Corinthians 6:6 — By pureness, by knowledge, by long suffering, by kindness, by the Holy Ghost, by love unfeigned.
1 Peter 1:22 — Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently.