Interestingly, this term is used only 5 times, and all in 1 Corinthians....1 Cor 1:18 does not state that "natural man ... does not comprehend the gospel".
1 Corinthians 1:
17 For Christ sent me not to baptize, but to preach the gospel: not with wisdom of words, lest the cross of Christ should be made of none effect.
18 For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.
These verses do not state that those who are perishing cannot understand the message of the cross ... they do understand ... and they consider the message of the cross foolish. iow, they suppress the truth in unrighteousness due to holding man's wisdom (the wisdom of words – 1 Cor 1:17 or the wisdom of the wise – 1 Cor 1:19) above the wisdom of God.
1 Corinthians 2:14 But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
As explained to you many many times, what is referred to in 1 Cor 2:14 speaks of spiritual aspects of the wisdom of God which go beyond the scope of the gospel. Once a person is born again ... then he or she is to feed on the milk of the Word until he or she is able to eat meat and move on to spiritual truths that are revealed in 1 Cor 2:6-16.
don't know if you'll believe this truth or again suppress the truth in unrighteousness ... we'll only know when the tenor of your panels reflects the increase God brings to your heart concerning what is written in 1 Cor 2:14 and you finally quit conflating what is written in 1 Cor 1:18 with what is written in 1 Cor 2:6-14.
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[1Co 1:18 KJV]
For the preaching of the cross is to them that perish foolishness;[G3472] but unto us which are saved it is the power of God.
[1Co 1:21 KJV]
For after that in the wisdom of God the world by wisdom knew not God, it pleased God by the foolishness[G3472] of preaching to save them that believe.
[1Co 1:23 KJV]
But we preach Christ crucified, unto the Jews a stumblingblock, and unto the Greeks foolishness;[G3472]
[1Co 2:14 KJV]
But the natural man receiveth not the things of the Spirit of God: for they are foolishness[G3472] unto him: neither can he know [them], because they are spiritually discerned.
[1Co 3:19 KJV]
For the wisdom of this world is foolishness[G3472] with God. For it is written, He taketh the wise in their own craftiness.