'Unholy' in the Bible

You shall not offer any strange incense on this altar, or burnt offering or meal offering; you shall not pour out a drink offering on it.

Now Nadab and Abihu, the sons of Aaron, took their respective [ceremonial] censers, put fire in them, placed incense on it and offered strange (unauthorized, unacceptable) fire before the Lord, [an act] which He had not commanded them to do.

and to make a distinction and recognize a difference between the holy (sacred) and the common (profane), and between the [ceremonially] unclean and the clean;

But Nadab and Abihu died [in the presence of God] when they offered [in their ceremonial censers] strange [unholy, unacceptable, unauthorized] fire before the Lord.

“When you come to appear before Me,Who requires this of you, this trampling of My [temple] courts [by your sinful feet]?

For those who are living according to the flesh set their minds on the things of the flesh [which gratify the body], but those who are living according to the Spirit, [set their minds on] the things of the Spirit [His will and purpose].

I know and am convinced [as one] in the Lord Jesus that nothing is unclean [ritually defiled, and unholy] in itself; but [nonetheless] it is unclean to anyone who thinks it is unclean.

So put to death and deprive of power the evil longings of your earthly body [with its sensual, self-centered instincts] immorality, impurity, sinful passion, evil desire, and greed, which is [a kind of] idolatry [because it replaces your devotion to God].

For people will be lovers of self [narcissistic, self-focused], lovers of money [impelled by greed], boastful, arrogant, revilers, disobedient to parents, ungrateful, unholy and profane,

For if the sprinkling of [ceremonially] defiled persons with the blood of goats and bulls and the ashes of a [burnt] heifer is sufficient for the cleansing of the body,

to execute judgment upon all, and to convict all the ungodly of all the ungodly deeds they have done in an ungodly way, and of all the harsh and cruel things ungodly sinners have spoken against Him.”

They used to say to you, “In the last days there will be scoffers, following after their own ungodly passions.”