1: ἀθῶος
(Strong's #121 — Adjective — athoos — ath'-o-os )

primarily denotes "unpunished" (a, negative, thoe, "a penalty"); then, "innocent," Matthew 27:4 , "innocent blood," i.e., the blood of an "innocent" person, the word "blood" being used both by synecdoche (a part standing for the whole), and by metonymy (one thing standing for another), i.e., for death by execution (some mss. have dikaion, "righteous"); Matthew 27:24 , where Pilate speaks of himself as "innocent."

2: ἄκακος
(Strong's #172 — Adjective — akakos — ak'-ak-os )

lit., "not bad" (a, negative, kakos, "bad"), denotes "guileless, innocent," Romans 16:18 , RV, "innocent" (AV, "simple"); "harmless" in Hebrews 7:26 . See HARMLESS.