37 Heb “there is.” The term יֵשׁ (yesh, “there is”) is often used in aphorisms to assert the existence of a particular situation that occurs sometimes. It may indicate that the situation is not the rule but that it does occur on occasion, and may be nuanced “sometimes” (e.g., Prov 11:24; 13:7, 23; 14:12; 16:25; 18:24; 20:15; Eccl 2:21; 4:8; 5:12; 6:1; 7:15 [2×]; 8:14 [3×]).
38 The noun רָעָה (ra’ah, “evil”) probably means “misfortune” ( רָעָה 4) or “injustice, wrong” ( רָעָה 2.b). The phrase רָעָה רַבָּה (ra’ah rabbah) connotes “grave injustice” or “great misfortune” (Eccl 2:17; 5:12, 15; 6:1; 10:5).
39 Heb “under the sun.”

In other versions

There is a grievous evil that I have seen under the sun: riches were kept by their owner to his hurt,

I have seen a grievous evil under the sun:

wealth hoarded to the harm of its owners,

There is a sickening tragedy I have seen under the sun: wealth kept by its owner to his harm.

There is another serious problem I have seen under the sun. Hoarding riches harms the saver.

There is a grievous evil which I have seen under the sun: wealth hoarded by its owner to his harm.

There is a sore evil which I have seen under the sun, namely, riches kept for the owners thereof to their hurt.

Public Domain