sketchy
Meaning
not thorough or complete, lacking in detail
seeming untrustworthy, dishonest, or dangerous
Structure
Usage
the witness provided only a sketchy description of the suspect.
his knowledge of the subject is rather sketchy.
we decided not to go into that sketchy neighborhood at night.
Etymology
the word "sketchy" originates from the artistic term "sketch," which entered english in the 17th century from the dutch schets or italian schizzo, both deriving from the latin schedium, meaning an impromptu poem, and ultimately from greek schedios, meaning "extemporaneous." the core semantic link is from the concept of a rough, unfinished drawing to the modern abstract meanings. the adjective-forming suffix "-y" attaches to this root, creating a term that characterizes something as being like a sketch—incomplete, vague, or lacking substance. by the mid-19th century, this literal sense extended figuratively to describe information, plans, or people that are insubstantial or unreliable, capturing the notion of something not fully formed or trustworthy.
Analysis
sketch (from dutch schets or italian schizzo, meaning a rough drawing or outline; functional role: root conveying the core concept of incompleteness or roughness). y (from old english -ig, a common suffix forming adjectives meaning "characterized by" or "full of"; functional role: derivational suffix).