What does it indicate if an idea is "obscure"?

When an idea is described as "obscure," it indicates that it is difficult to grasp or understand. The term "obscure" often suggests a lack of clarity, leaving the concept vague and not easily comprehensible to most people. It may involve complex, ambiguous, or confusing elements that hinder full understanding. For instance, philosophical arguments or poetic texts can often be obscure if they do not communicate their points plainly or directly, thus requiring deeper contemplation or additional explanation.

The other options describe characteristics that are opposite to obscurity: wide acceptance, clarity, and a well-defined context all imply that an idea is easily understood and accessible to a broader audience.