Answer: one who “conceals (hides) hatred”
As ‘it is written’:
“He who conceals hatred has lying lips…” (first part of Proverbs 10:18)
And where do “liars” go?
The “Lake of Fire” too for ‘that part’ of ‘evil’ in them to be “destroyed” completely:
“But for the cowardly and unbelieving and abominable and murderers and immoral persons and sorcerers and idolaters and ALL LIARS, their part will be in the lake that burns with fire and brimstone, which is the second death.” (Revelation 21:8)
People who actually hate other people are the ones given up to lies; such hatred is not seen due to it being hidden or concealed. Point? God doesn’t make any mistake in His Judgment as He Will reveal it according to His Word One Day during Judgment too before assigning their lot in the Lake of Fire “as it is written”.
The most serious lies are those spoken with regards to God; we need to be utterly careful about ‘what we say & believe’ about Him. Let it be according to Scripture “as it is written” (when it’s properly translated first) to be on the safest path regarding this. Remember the Pharisees & though we are not perfect regarding this matter too, may God have Mercy on whom He Wills.