Strong's Concordance

Original word: φυσικῶς
Transliteration: phusikós
Definition (short): instinct
Definition (full): naturally, by nature

NAS Exhaustive Concordance

Word Origin: adverb from phusikos
Definition: naturally, by nature
NASB Translation: instinct (1).
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Strong's Exhaustive Concordance

Adverb from phusikos; "physically", i.e. (by implication) instinctively -- naturally.

see GREEK phusikos

KJV: But these speak evil of those things which they know not: but what they know naturally, as brute beasts, in those things they corrupt themselves.
NASB: But these men revile the things which they do not understand; and the things which they know by instinct, like unreasoning animals, by these things they are destroyed.