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Is there a concise way to describe something that is poorly designed, such that users are likely to accidentally make errors when using it? I'm looking for pretty much an exact antonym for "foolproof".

As an example, suppose there's a UI for job management that allows jobs to be canceled. When the "Cancel" button is clicked, a dialog appears saying "Canceling will lose job progress. Do you want to let the job finish? [Yes] / [No]" Clicking "No" will actually abort the job. The UI is working as designed, but since many users will not read the full message and assume that the opposite question is being asked, they are likely to use it incorrectly and mistakenly choose the wrong option. The UI itself works as intended and is not directly failing or causing the error, but its design is causing others to make mistakes.

I'd like a concise yet generalizable way to say, "This UI is [likely to be the cause of frequent user error]." So far the best word that I have is "confusing" but I'd like something stronger and more specific.

"Error-prone" is close, but I feel like that more strongly means "liable to make mistakes" instead of "cause mistakes to be made."

I'm not satisfied with the following words, because they suggest a defect of implementation (that it can fail even if used "correctly") and don't sufficiently convey an error-causing design: "defective", "faulty", "flawed", "imperfect", "undependable", "unreliable", "fallible"

I would also like to avoid direct or implicit criticism of the creator, so I don't want to say "poorly designed."

This UI is:

- Nonobvious = Not easily discovered, seen, or understood

- Unclear = not clear

- Counterintuitive = contrary to what one would intuitively expect

- Illogical = not observing the principles of logic

It is difficult to correct someone without risking direct or implicit criticism.

Misleading

Giving the wrong idea or impression - OOD

A confirmation pop-up is expected to ask if the user wants to continue. When it asks the negation of what is expected many people can be expected to answer incorrectly.

I read the title of the question and immediately thought of error prone—before reading the rest of the question. I personally don't think there is a better phrase than that. It's open to interpretation and context what the reason is behind the possible errors.

Having said that, another possible word is fallible:

1 : liable to be erroneous

// a fallible generalization
2 : capable of making a mistake

// we're all fallible

In short:

The UI is fallible.

inherently flawed

Inherent literally refers to something that is "stuck in" something else so firmly that they can't be separated. A plan may have an inherent flaw that will cause it to fail; a person may have inherent virtues that everyone admires. Since the flaw and the virtues can't be removed, the plan may simply have to be thrown out and the person will remain virtuous forever.

-Merriam Webster

So if the UI is inherently flawed it refers to the design and not the designer.

This UI is:

1. not user-friendly (specific)


2. overly complex


3. unintuitive


4. dangerous (general)

As a side note:
You mentioned you wanted to avoid criticism of the creator, but be aware the word you're asking for will be a word of opinion. In most cases, qualifiers can be used to fine-tune the intent of your word choice. Depending on the style and perspective of the writing, you may be able to use words of emotion to get more control of the overall message you are trying to convey.

Consider the change of intent as you read:

• This UI is unintuitive. (declarative)
  


• This UI may be unintuitive. (suggestive)
  


• This UI may be unintuitive to new users. (informative)
  


• I feel that this UI may be unintuitive. (personal, suggestive)
  


• I feel that this UI may be unintuitive to new users. (personal, informative)