1. most lacking in detail or completeness; most roughly outlined
Usage: superlative form of sketchy
2. most suspicious, unreliable, or questionable
Usage: informal; superlative form of sketchy

Examples

• This is the sketchiest plan we’ve ever considered.
• He gave us only the sketchiest details about what happened.
• That’s the sketchiest neighborhood in the entire city.
• Her explanation was the sketchiest part of her testimony.
• The sketchiest information came from unreliable sources.
• This is the sketchiest website I’ve ever visited.
• The sketchiest outline barely covered the main points.