Flimsy

A wonderful person recently reminded me of a wonderful word: flimsy. This is an adjective, and if we're talking about an object (like a fabric or other material), it means "light, thin and insubstantial; lacking solidity or strength." If we're talking about an idea, theory or argument, it means "lacking plausability, unconvincing". Here are a few examples:

Mary's flimsy umbrella was no match for the strong wind and rain, and it broke a few minutes after she left the house.

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Hi Bob,

Thanks for your message about the meeting with Tom and Dave. I think the presentation is good in general, but I'm concerned that the product section is a bit flimsy. I don't think what we have will convince them to upgrade; could you review it and see what you can do to make it stronger? Thanks!

All best,

Anne
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Salesperson: Can I help you?
You: Yes, I'm looking for some summer curtains.
Salesperson: Are you looking for anything specific?
You: Well, I want something light and summery, but not so flimsy that it will fall apart after one summer.
Salesperson: Right. I think we have some things over here that might be just right.

Flimsy is a regular adjective, so: flimsy, flimsier, the flimsiest.