barrierless (not comparable)
- Lacking barriers
- The world is increasingly barrierless.
- (chemistry) Not requiring activation energy
1992, R.A. Marcus & Prabha Siddarth, “Theory of Electron Transfer Reactions and Comparison with Experiments”, in Elise Kochanski, editor, Photoprocesses in Transition Metal Complexes, Biosystems, and Other Molecules, page 63:
- The reaction is then barrierless, ie, ΔG* = 0, and the rate constant is a maximum for the given λ (Figure 6).