Strong's Concordance

Original word: νόθος
Transliteration: nothos
Definition (short): illegitimate
Definition (full): a bastard, baseborn

NAS Exhaustive Concordance

Word Origin: a prim. word
Definition: a bastard, baseborn
NASB Translation: illegitimate children (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

Of uncertain affinity; a spurious or illegitimate son -- bastard.
KJV: But if ye be without chastisement, whereof all are partakers, then are ye bastards, and not sons.
NASB: But if you are without discipline, of which all have become partakers, then you are illegitimate children and not sons.