Ecclesiastes 7:29

Upright. From the verb “to be straight,” “to be right.” The reference is to moral uprightness.

Inventions. This same word is rendered in 2 Chron. 26:15 as “engines,” that is, contrivances, or engines of war such as for hurling stones. The root verb means “to think,” “to devise,” “to invent” (see Amos 6:5). Man has fallen from his original condition of moral rectitude and has become adept at contriving things that, though not necessarily evil of themselves, are employed in such a way as to lead men into immorality.