Adjectives of Abstract Attributes - Adjectives of Difficulty and Ambiguity

needing a lot of skill or effort to do

needing a lot of work or skill to do, understand, or deal with

difficult to achieve or deal with

(of materials, courses, texts, etc.) complex and intended for individuals with prior knowledge or skill

having a level of knowledge or skill that is between beginner and advanced

difficult to do or handle and requiring skill or caution

requiring vigorous effort, particularly on a continuous basis

(of actions or efforts) determined and energetic

(of a task) needing great effort, skill, etc.

requiring significant effort, skill, or determination to overcome or accomplish successfully

presenting difficulties or concerns, often requiring careful consideration or attention

not exactly known or expressed, often leading to confusion or ambiguity

not clear or specific, lacking in detail or precision

not easily defined or understood due to a lack of clarity or precision

not easily understood

unclear and not precisely stated or defined

suggesting something without directly stating it

hard to achieve, find, remember, or define

(of speech or written discourse) unclear or poorly organized in a way that is not comprehensible

confusing and difficult to understand

not clear or easily understood

causing confusion due to being complex or unclear

difficult to understand due to being complex or obscure

having mysterious and puzzling characteristics

vague and unclear, often used to describe ideas, concepts, or situations that are indistinct or hard to understand

difficult or impossible to comprehend, identify, or explain

lacking clear definition or sharpness, appearing indistinct or blurry