Quick Definition
σκληρότης, τητος, ἡ n.f. hardness of heart
Strong's Definition
from 4642; callousness, i.e. (figuratively) stubbornness
KJV Usage: hardness
UBS Dictionary of the Greek New Testament
noun, f. | -ητος | σκληρύνω
88.223 · Moral and Ethical Qualities and Related Behavior · Stubbornness
stubbornness a stubborn attitude with regard to any change in behavior In a number of languages stubbornness may be described as ‘refusing to change’ or ‘refusing to think differently.’ In some instances stubbornness may be expressed idiomatically as ‘one’s heart only sees one thing’ or ‘one’s heart is blind’ or ‘one who always says No.’
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
σκληρότης, -7Tos, 7, (σκληρός), hardness; trop. obstinacy, stubbornness: Ro. ii. 5. (Deut. ix. 27; [Antipho], Plat., Aristot., Theophr., Plut., al.)
Mounce Concise Greek Dictionary
σκληρότης sklērotēs 1x
hardness; met. σκληρότης τῆς καρδίας, hardness of heart, obstinacy, perverseness, Rom. 2:5*
Abbott-Smith Greek Lexicon
σκληρότης, -ητος, ἡ
(< σκληρός), [in LXX: De 9:27 (קְשִׁי), etc. ;]
hardness; metaph., of stubbornness: Ro 2:5.†
Moulton & Milligan — Vocabulary of the Greek NT
σκληρότης is found once (Rom 2°) in the NT = ‘‘obstinacy.” For σκλήρωσις see P Leid ΧΕΙ (iii/iv a.p.) (ΞΞ 11. p. 205) μολίβου κάθαρσις kal σλήρωσις (/. σκλήρωσις). Σκληρασία (not in LS§) is seen in 20.» 4 (p. 233) κασσιτέρου σκληρασία.
Liddell-Scott-Jones — Greek-English Lexicon
σκληρότης (sklērotēs) — hardness. σκληρότης, ητος, ἡ, hardness, opposed to μαλακότης, [Refs 5th c.BC+]
2. of taste, harshness, οἴνου [Refs 4th c.BC+]
3. stiffness, rigidity, [Refs 4th c.BC+]
4. ἡ τῆς κοιλίης σ. costivity, [Refs 5th c.BC+]
II. of persons, harshness, austerity, τοῦ δαίμονος [Refs 5th c.BC+]