1 completely, wholly, altogether, fully, totally, utterly, unreservedly, unqualifiedly, unexceptionally, in every respect, in all respects, thoroughly, to a T, in toto, exhaustively, all out, from head to toe or foot, (right) down to the ground, from A to Z, lock, stock and barrel, root and branch, without exception or reservation:
She was entirely satisfied. I agree with that entirely.
2 solely, exclusively, only, unambiguously, unequivocally; positively, definitely, clearly:
It was entirely my fault.