Romans 4:21
Parallel Strong's
Berean Study Bible
being fully persuaded that God was able to do what He had promised.

Young's Literal Translation
and having been fully persuaded that what He hath promised He is able also to do:

King James Bible
And being fully persuaded that, what he had promised, he was able also to perform.

Greek
being fully persuaded that
πληροφορηθεὶς (plērophorētheis)
Verb - Aorist Participle Passive - Nominative Masculine Singular
Strong's 4135: From pleres and phoreo; to carry out fully, i.e. Completely assure, entirely accomplish.

[God] was
ἐστιν (estin)
Verb - Present Indicative Active - 3rd Person Singular
Strong's 1510: I am, exist. The first person singular present indicative; a prolonged form of a primary and defective verb; I exist.

able
δυνατός (dynatos)
Adjective - Nominative Masculine Singular
Strong's 1415: (a) of persons: powerful, able, (b) of things: possible. From dunamai; powerful or capable; neuter possible.

to do
ποιῆσαι (poiēsai)
Verb - Aorist Infinitive Active
Strong's 4160: (a) I make, manufacture, construct, (b) I do, act, cause. Apparently a prolonged form of an obsolete primary; to make or do.

what
(ho)
Personal / Relative Pronoun - Accusative Neuter Singular
Strong's 3739: Who, which, what, that.

He had promised.
ἐπήγγελται (epēngeltai)
Verb - Perfect Indicative Middle or Passive - 3rd Person Singular
Strong's 1861: From epi and the base of aggelos; to announce upon, i.e. to engage to do something, to assert something respecting oneself.

                                                                                                                                                                                                                                                           
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Romans 4:20
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