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Greek verb · G4645

σκληρύνω

sklerynosklay-roo'-no

to harden

6 uses in the Greek text, one for each word STEP Bible has tagged with this key

Concordance spelling: sklērýnō

Word page · Part of the concordance, one page for every word of the Hebrew and Greek text. Strong's G4645is this word's number in James Strong's 1890 index of the King James Bible.

  • 3 of 27
    New Testament books
  • 4
    spellings

The definition in full

Strong's key (1890) · G4645

to indurate, i.e. (figuratively) render stubborn

The King James renders it: harden.

James Strong, The Exhaustive Concordance of the Bible (1890), public domain. Strong indexed the King James text, and this site quotes his entry as that index.

Summary

skleryno is rendered "to harden". It stands 6 times in the Greek text, across three books.

  • Four of the uses stand in Hebrews, more than in any other book.
  • Its first use in canonical order opens the ledger below.Acts 19:9But when some of them stubbornly refused to believe and publicly maligned the Way, Paul took his disciples and left the synagogue to conduct daily discussions in the lecture hall of Tyrannus.
  • The Greek text spells it four different ways.

The first use

But when some of them stubbornly refused to believe and publicly maligned the Way, Paul took his disciples and left the synagogue to conduct daily discussions in the lecture hall of Tyrannus.

Acts 19:9ἐσκληρύνοντο

The first use, in the order of the New Testament's books.

Where the word stands

Four of the word's six uses are in Hebrews.

The other 24 New Testament books never use the word.

What the word means

Each meaning, and the words it is translated by

How the Greek text is glossed, word by word

  • shall harden3
  • He hardens1
  • may be hardened1
  • were hardened1

The words built on the same word-part

Each word below begins with the same letters this one begins with. A shared word-part shows a family. It does not settle what any one of them means, so each word carries its own uses on its own page. Scholars call that shared part the stem.

σκληρόςskleroshardUses5
σκληροκαρδίαsklerokardiahardness of heartUses2
σκληρότηςskleroteshardnessUses1
σκληροτράχηλοςsklerotrachelosstiff-neckedUses1

All 6, in canonical order

Every use, in order

Every use, grouped by book, with its verse.

4 spellings and their grammar

STEP Bible tags every word of the Hebrew and Greek text with its spelling and its grammar. Both lists below count the rows printed underneath, written out in English, with the code beside each one as it was tagged.

How it is spelled

  • σκληρύνητε3
  • ἐσκληρύνοντο1
  • σκληρύνει.¶1
  • σκληρυνθῇ1

The grammar of each form

  • verb · aorist active, subjunctive · 2nd person plural3V-AAS-2P
  • verb · aorist passive, subjunctive · 3rd person singular1V-APS-3S
  • verb · imperfect passive, indicative · 3rd person plural1V-IPI-3P
  • verb · present active, indicative · 3rd person singular1V-PAI-3S

Acts

one use
  • But when some of them stubbornly refused to believe and publicly maligned the Way, Paul took his disciples and left the synagogue to conduct daily discussions in the lecture hall of Tyrannus.

    Acts 19:9

    • ἐσκληρύνοντοesklerunontoverb · imperfect passive, indicative · 3rd person pluraltagged: were hardened

Romans

one use
  • Therefore God has mercy on whom He wants to have mercy, and He hardens whom He wants to harden.

    Romans 9:18

    • σκληρύνει.¶skleruneiverb · present active, indicative · 3rd person singulartagged: He hardens

Hebrews

four uses
  • do not harden your hearts, as you did in the rebellion, in the day of testing in the wilderness,

    Hebrews 3:8

    • σκληρύνητεskleruneteverb · aorist active, subjunctive · 2nd person pluraltagged: shall harden
  • But exhort one another daily, as long as it is called today, so that none of you may be hardened by sin’s deceitfulness.

    Hebrews 3:13

    • σκληρυνθῇskleruntheaverb · aorist passive, subjunctive · 3rd person singulartagged: may be hardened
  • As it has been said: “Today, if you hear His voice, do not harden your hearts, as you did in the rebellion.”

    Hebrews 3:15

    • σκληρύνητεskleruneteverb · aorist active, subjunctive · 2nd person pluraltagged: shall harden
  • God again designated a certain day as “Today,” when a long time later He spoke through David as was just stated: “Today, if you hear His voice, do not harden your hearts.”

    Hebrews 4:7

    • σκληρύνητεskleruneteverb · aorist active, subjunctive · 2nd person pluraltagged: shall harden

Where it leads

How the numbers are counted

Every count on this page comes from STEP Bible's tagged Hebrew and Greek text, the same text the ledger prints. A use is counted once each time the tagging marks a word with this key.

Spellings are counted as the Greek text spells them, with the sentence's own punctuation taken off the word first, so a form that ends a clause is not counted as a second spelling.

The family is read from the lexicon by the stem the two words share, with the accents off, and a person or a place named on the stem is left out.

Hebrew and Greek text, word tagging and grammar: STEP Bible (www.STEPBible.org), Tyndale House, CC BY 4.0. Their grammar codes are written out in English here and shown as tagged beside each one.

Meaning and senses: STEP Bible TBESG (Tyndale House, CC BY 4.0), the Brief lexicon based on Abbott-Smith (1922).

Dictionary key: Strong's Exhaustive Concordance of the Bible (1890, public domain). English verse text: Berean Standard Bible (public domain, 2023).

Revised 2026-09-05. Every cited work, the sources registry →