Strong's Concordance

Original word: ἀδάπανος
Transliteration: adapanos
Definition (short): charge
Definition (full): without expense

NAS Exhaustive Concordance

Word Origin: from alpha (as a neg. prefix) and dapané
Definition: without expense
NASB Translation: without charge (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From a (as negative particle); and dapane; costless, i.e. Gratuitous -- without expense.

see GREEK a

see GREEK dapane

KJV: What is my reward then? Verily that, when I preach the gospel, I may make the gospel of Christ without charge, that I abuse not my power in the gospel.
NASB: What then is my reward? That, when I preach the gospel, I may offer the gospel without charge, so as not to make full use of my right in the gospel.