not handling large sums of money wisely
Unwise in dealing with large sums of money or large matters.
Origin of pound-foolishFrom the phrase penny-wise, pound-foolish.
(comparative more pound-foolish, superlative most pound-foolish)
- Being unwise in dealing with large amounts of money.
From penny-wise and pound-foolish (“thrifty in the small and wasteful in the large")