frothy

1. (figurative) lightweight; lacking depth or substanceExamples: "songs with frothy lyrics"; "a frothy argument"; "I cannot describe to you what pain I feel in repeating this light and frothy conversation, but I have compelled myself to give it you at some length, in order to lay before you, in its true light, the weakness of that heart which is not upheld by divine strength, and to shew you how little dependence can be placed on those who walk in their own strength, and are not divinely upheld."figuratively

2. (business) Highly speculative; having high risk and high return.Examples: "But we have found it profitable to engage in some trading on our own account, generally in the rather frothy areas."; "First, many of the welfare gains of the previous two decades or more turned out to have been illusory, as house and share prices tumbled, jobs disappeared and frothy investment opportunities collapsed."; "In such a “frothy” market, investors' interests would generally have been served by selling rather than purchasing assets—and, in fact, by returning committed capital to investors rather than deploying it, since acquisitions generally would not be accretive."