Etymology
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sketchy (adj.)

1805, "having the form or character of a sketch," from sketch (n.) + -y (2). Colloquial sense of "unsubstantial, imperfect, flimsy" is from 1878, perhaps via the notion of "unfinished." Related: Sketchily; sketchiness.

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Definitions of sketchy

sketchy (adj.)
giving only major points; lacking completeness;
a sketchy account
details of the plan remain sketchy
Synonyms: unelaborated
From wordnet.princeton.edu