The Hebrew verb tamam means to be complete, finished, whole, or blameless. It is the verbal root of tamiym (H8549, whole/blameless) and tom (H8537, integrity/completeness). It describes the state of being whole, lacking nothing, morally upright.
Tamam is used for the completion of building projects, the fulfilling of time periods, and especially moral integrity. Noah (Genesis 6:9) and Job are described with related forms as blameless. The Psalms use it to describe those who walk uprightly before God.
Theologically, tamam sets the standard for covenant faithfulness: a whole-hearted, undivided, complete devotion to YHWH. It anticipates Jesus' call to 'be perfect as your heavenly Father is perfect' (Matthew 5:48) — not sinless perfection but wholeness of heart and intention.