1: ἄπειρος
(Strong's #552 — Adjective — apeiros — ap'-i-ros )

"without experience" (a, negative, peira, "a trial, experiment"), is used in Hebrews 5:13 , RV, "without experience," AV, "unskillful," with reference to "the word of righteousness." In the Sept., Numbers 14:23 , of youths; Jeremiah 2:6 , of a land, "untried;" Zechariah 11:15 , of a shepherd.

2: δοκιμή
(Strong's #1382 — Noun Feminine — dokime — dok-ee-may' )

means (a) "the process of proving;" it is rendered "experiment" in 2—Corinthians 9:13 , AV, RV, "the proving (of you);" in 2—Corinthians 8:2 , AV, "trial," RV, "proof;" (b) "the effect of proving, approval, approvedness," RV, "probation," Romans 5:4 (twice), for AV, "experience;" AV and RV, "proof" in 2—Corinthians 2:9; 13:3; Philippians 2:22 . See EXPERIENCE , PROOF. Cp. dokimos, "approved," dokimazo, "to prove, approve;" see APPROVE.