Vibrational-to-translational energy transfer between the lowest vibrational levels (v(')=0-4) of the A(0(u)(+)) state of Bi-2 has been investigated using spectrally resolved, laser-induced fluorescence techniques. The small vibrational spacing (omega(e)(')similar or equal to 132 cm(-1)) leads to highly nonadiabatic conditions, particularly for the Bi-2(A)-He collision pair. However, the Delta v=-1 transition probabilities for collisions with the rare gases range from 0.75% to 1.75% per collision, considerably lower than would be anticipated from standard vibrational energy transfer theory. Multiquantum (Delta v(')=+/- 2) transfer rates are low, consistent with the low anharmonicity of the A(0(u)(+)) state. The rates for Delta v(')=+/- 1 transitions scale linearly with vibrational quantum number as expected near the bottom of this nearly harmonic potential.