Antonyms for the word "more fluctuant" include words like stable, steady, constant, unfluctuating, and firm. Each of these terms implies a sense of consistency and reliability, rather than the variability and inconsistency suggested by the word "fluctuant." For example, a stock that is "stable" is one that is less likely to experience sudden changes in value, whereas one that is "fluctuant" is likely to be more volatile and unpredictable. Similarly, a "steady" hand is one that is less likely to shake or move around, whereas one that is "fluctuant" may be more unsteady or uncertain. In all cases, the antonyms for "more fluctuant" suggest a greater degree of certainty and predictability.