future-proof Share definition Flag 1. adj. Capable of adapting or conforming to standards not yet known; customizable. I only needed the power of a single graphics card in my PC, but I got a great future-proof motherboard that supports quad SLI. future-proof by subignition June 29, 2008 0 0 Get merch Get the future-proof mug. Buy Now — $32.95 See more merch