5446. phusikos
Lexical Summary
phusikos: natural, creatures of instinct

Original Word: φυσικός
Part of Speech: Adjective
Transliteration: phusikos
Pronunciation: foo-see-kos'
Phonetic Spelling: (foo-see-kos')
KJV: natural
NASB: natural, creatures of instinct
Word Origin: [from G5449 (φύσις - nature)]

1. "physical"
2. (by implication) instinctive

Strong's Exhaustive Concordance
natural.

From phusis; "physical", i.e. (by implication) instinctive -- natural. Compare psuchikos.

see GREEK phusis

see GREEK psuchikos

HELPS Word-studies

Cognate: 5446 physikós (an adjective, derived from 5449 /phýsis, "nature") – natural, describing the behavior of an unregenerate person, i.e. a nature lacking divine transformation (salvation). See 5449 (physis).

NAS Exhaustive Concordance
Word Origin
from phusis
Definition
natural, according to nature
NASB Translation
creatures of instinct (1), natural (2).

Thayer's Greek Lexicon
STRONGS NT 5446: φυσικός

φυσικός, φυσικη, φυσικον (φύσις), natural; i. e., a. produced by nature, inborn (very often so from Xenophon, (mem. 3, 9, 1) down).

b. agreeable to nature (Dionysius Halicarnassus, Plutarch, others): opposed to παρά φύσιν, Romans 1:26,(27).

c. governed by (the instincts of) nature: ζῷα γεγεννημένα φυσικά, 2 Peter 2:12 (R. V. born mere animals).

Topical Lexicon
Scope of the Word

Strong’s Greek 5446, physikos, describes what accords with the created order—what functions “by nature” or “by instinct.” In Scripture the term stands at two poles: (1) morally neutral instinctual behavior, and (2) the divinely established pattern for human sexuality.

Occurrences in the New Testament

1. Romans 1:26-27 – Twice Paul speaks of “natural relations” (physiken chresin) when setting the male-female union over against same-sex acts.
2. 2 Peter 2:12 – False teachers are compared with “creatures of instinct” (phy­sika zōa), emphasizing their animal-like impulses that ignore moral revelation.

Romans 1:26-27 and the Created Order

“For this reason God gave them over to dishonorable passions. Even their women exchanged natural relations for unnatural ones. Likewise, the men abandoned natural relations with women and burned with lust for one another”.

a. Created design. Paul’s use of physikos anchors sexual ethics in Genesis 1-2, where male and female are joined for fruitfulness and fellowship.

b. Moral deviation. “Unnatural” implies a conscious departure from what God built into humanity, not merely an alternative orientation.

c. Judicial consequence. God “gave them over,” revealing His wrath by allowing sin to bear its own destructive fruit.

2 Peter 2:12 and Instinctual Living

“These men are like irrational animals, creatures of instinct, born to be captured and destroyed”.

a. Contrast with Spirit-led conduct. Instead of living according to divine revelation, the false teachers operate on sheer appetite.

b. Eschatological warning. Living only by instinct invites judgment, for humans are accountable creatures, not mere animals.

Theological Themes

1. Natural Law. Physikos supports the biblical teaching that moral norms are woven into creation itself (Romans 2:14-15).
2. Image of God. Humans surpass animal instinct through rationality and conscience; when they suppress truth, they descend below their design.
3. Sin’s Distortion. Departure from the natural order is both symptom and catalyst of deeper rebellion against God.

Historical Reception

• Early Church. Writers such as Clement of Alexandria and John Chrysostom read Romans 1 as evidence that same-sex practice violates creation.
• Medieval Theology. Natural law reasoning—rooted in physikos—shaped Christian ethics, influencing figures like Thomas Aquinas.
• Reformation and Beyond. Protestants maintained the link between nature and Scripture, viewing physikos as confirming, never contradicting, God’s Word.

Ministry Implications

1. Sexual Ethics. Physikos undergirds pastoral counsel affirming marriage between one man and one woman. Compassion is extended to all, yet genuine love calls people back to God’s design.
2. Discipleship. Believers resist merely instinctual living by walking in the Spirit (Galatians 5:16-25).
3. Apologetics. The term offers common-ground arguments: observable design in nature aligns with biblical revelation, exposing the emptiness of purely subjective morals.

Related Terms

• Phusis (Strong’s 5449) – “nature” itself; physikos describes what belongs to that nature.
• Para phusin (Romans 1:26) – “against nature,” the antithesis of physikos.
• Pneumatikos (Strong’s 4152) – “spiritual,” highlighting the life empowered by the Holy Spirit, not mere instinct.

Summary

Physikos presents a concise biblical witness: God created an ordered world whose moral contours are discernible. Whether warning against animal-like false teachers or defining holy sexuality, the New Testament employs this word to call believers from instinct to obedience, from distortion to design, and from rebellion to redeemed living under the lordship of Christ.

Forms and Transliterations
φυσικα φυσικά φυσικὰ φυσικην φυσικήν φυσικὴν phusika phusiken phusikēn physika physikà physiken physikēn physikḕn
Links
Interlinear GreekInterlinear HebrewStrong's NumbersEnglishman's Greek ConcordanceEnglishman's Hebrew ConcordanceParallel Texts
Englishman's Concordance
Romans 1:26 Adj-AFS
GRK: μετήλλαξαν τὴν φυσικὴν χρῆσιν εἰς
NAS: exchanged the natural function
KJV: women did change the natural use into
INT: changed the natural use into

Romans 1:27 Adj-AFS
GRK: ἀφέντες τὴν φυσικὴν χρῆσιν τῆς
NAS: abandoned the natural function
KJV: leaving the natural use
INT: having left the natural use of the

2 Peter 2:12 Adj-NNP
GRK: ζῷα γεγεννημένα φυσικὰ εἰς ἅλωσιν
NAS: born as creatures of instinct to be captured
KJV: these, as natural brute beasts,
INT: animals born natural for capture

Strong's Greek 5446
3 Occurrences


φυσικὰ — 1 Occ.
φυσικὴν — 2 Occ.

5445
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