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.

Entries linking to sketchy

sketch (n.)
"rough drawing intended to serve as the basis for a finished picture," 1660s, from Dutch schets or Low German skizze, both apparently 17c. artists' borrowings from Italian schizzo "sketch, drawing," which is commonly said to be from Latin *schedius (OED compares schedia "raft," schedium "an extemporaneous poem"), from or related to Greek skhedios "temporary, extemporaneous, done or made off-hand," related to skhema "form, shape, appearance" (see scheme (n.)). But according to Barnhart Italian schizzo is a special use of schizzo "a splash, squirt," from schizzare "to splash or squirt," of uncertain origin.

Extended sense of "brief account" is from 1660s; meaning "short play or performance, usually comic" is from 1789. Sketch-book recorded from 1820. German Skizze, French esquisse, Spanish esquicio are likewise from Italian schizzo.
-y (2)
adjective suffix, "full of or characterized by," from Old English -ig, from Proto-Germanic *-iga- (source also of Dutch, Danish, German -ig, Gothic -egs), from PIE -(i)ko-, adjectival suffix, cognate with elements in Greek -ikos, Latin -icus (see -ic). Originally added to nouns in Old English; used from 13c. with verbs, and by 15c. even with other adjectives (for example crispy).

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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

Dictionary entries near sketchy

skeptical

skepticism

*sker-

skerry

sketch

sketchy

*skeud-

skew

skewbald

skewer

skewness

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