The term "without clear outlines" can be described in many ways, such as ambiguous, vague, hazy, murky, nebulous, indistinct, undefined, ill-defined, and imprecise. These synonyms refer to something that has no definite or well-defined shape, structure, or boundary. A vague idea or concept lacks clarity or specificity, whereas a nebulous thought appears fuzzy or cloudy. Similarly, an ambiguous statement or instruction can be interpreted in more than one way, and an indistinct figure or shadow is not sharply outlined or well-defined. Whether it pertains to a design, plan, or idea, having clear outlines is important to avoid confusion or uncertainty.