The phrase 'most incremental' suggests an increase or growth that is gradual and step-by-step, rather than sudden or massive. Some synonyms for 'most incremental' that could be used to describe this type of growth might include 'gradual', 'step-by-step', 'slow and steady', 'moderate', 'marginal', 'slight', 'limited', 'progressive', 'incremental', 'measured', 'slow but sure', and 'consistent'. Each of these words implies a sense of steady growth or progress, suggesting that something is developing or increasing at a deliberate and sustainable pace. This could apply to anything from scientific research to economic growth to personal development.