← Greek Word-Study Library
πιστός / πιστή / πιστόν
PIS-tos
faithful, trustworthy, believing
adjective
Appears 67× in the Greek New Testament — common.

In the New Testament

Same root as πίστις (faith) and πιστεύω (believe). "Well done, good and πιστός servant" (Matt 25:21).

Memory Hook

PIS-tos — PISTon fires reliably — FAITHFUL and TRUSTWORTHY.

Master all 150 core Greek words.

MasteryHelp teaches Koine Greek and Biblical Hebrew with spaced repetition, mastery-based progression, and an AI tutor that knows your current lesson. Free during early access.

Start Learning Free Learn more about MasteryHelp →