Rom. 1:22 KJV (With Strong’s)

Professing themselves
phasko (Greek #5335)
to assert
KJV usage: affirm, profess, say.
Pronounce: fas'-ko
Origin: prolongation from the same as 5346
to be
einai (Greek #1511)
to exist
KJV usage: am, was. come, is, X lust after, X please well, there is, to be, was.
Pronounce: i'-nahee
Origin: present infinitive from 1510
sophos (Greek #4680)
wise (in a most general application)
KJV usage: wise. Compare 5429.
Pronounce: sof-os'
Origin: akin to σαφής (clear)
, theye became fools
moraino (Greek #3471)
to become insipid; figuratively, to make (passively, act) as a simpleton
KJV usage: become fool, make foolish, lose savour.
Pronounce: mo-rah'-ee-no
Origin: from 3474

Cross References

Rom. 11:25• 25For I do not wish you to be ignorant, brethren, of this mystery, that ye may not be wise in your own conceits, that blindness in part is happened to Israel, until the fulness of the nations be come in; (Rom. 11:25)
Prov. 25:14• 14Clouds and wind without rain, so is a man that boasteth himself of a false gift. (Prov. 25:14)
Prov. 26:12• 12Hast thou seen a man wise in his own eyes? There is more hope of a fool than of him. (Prov. 26:12)
Isa. 47:10• 10For thou hast confided in thy wickedness: thou hast said, None seeth me. Thy wisdom and thy knowledge, it hath seduced thee; and thou hast said in thy heart, It is I, and there is none but me. (Isa. 47:10)
Jer. 8:8‑9• 8How do ye say, We are wise, and the law of Jehovah is with us? Behold, certainly the lying pen of the scribes hath made it falsehood.
9The wise men are ashamed, they are dismayed and taken: behold, they have rejected Jehovah's word; and what wisdom is in them?
(Jer. 8:8‑9)
Jer. 10:14• 14Every man is become brutish, bereft of knowledge; every founder is put to shame by the graven image, for his molten image is falsehood, and there is no breath in them. (Jer. 10:14)
Matt. 6:23• 23but if thine eye be wicked, thy whole body will be dark. If therefore the light that is in thee be darkness, how great the darkness! (Matt. 6:23)
1 Cor. 1:19‑21• 19For it is written, I will destroy the wisdom of the wise, and set aside the understanding of the understanding ones.
20Where is the wise? where scribe? where disputer of this world? has not God made foolish the wisdom of the world?
21For since, in the wisdom of God, the world by wisdom has not known God, God has been pleased by the foolishness of the preaching to save those that believe.
(1 Cor. 1:19‑21)
1 Cor. 3:18‑19• 18Let no one deceive himself: if any one thinks himself to be wise among you in this world, let him become foolish, that he may be wise.
19For the wisdom of this world is foolishness with God; for it is written, He who takes the wise in their craftiness.
(1 Cor. 3:18‑19)

J. N. Darby Translation

professing themselves to be wise, they became fools,

W. Kelly Translation

Professing to be wise, they became fools,