When a supply is dwindling, it can be described as "running low." However, there are several synonyms that can be used in its place to add variation and interest to writing. "Depleted" is a stronger word that implies a near-complete exhaustion of a resource. "Limited" suggests that there is only a finite amount available. "Scarce" indicates that something is in short supply and difficult to obtain. "Diminished" suggests a gradual decrease in supply. "Running out" conveys a sense of urgency and impending depletion. By using these synonyms for "ran low," writers can add depth and variety to their language while still conveying the same message.