skizi

Transitive, and it takes an ordinary object: skizi domon, skizi planon, skizi la situacion. The noun skizo is the sketch itself, skizeto a quick little one, and skizlibro a sketchbook.

Both senses travel together, exactly as in English. You skizi a face with a krajono, and you also skizi an argument, a chapter or a proposal: the rough shape without the detail. Esperanto keeps the metaphor whole, so li skizis la historion en dek minutoj is perfectly ordinary.

One root, no seam. Skiz- looks as though it might be hiding something, and it is not. There is no prefix sk-, no suffix -iz- in Esperanto, and no root i. The whole four letters came in from German Skizze as a unit, which came from Italian schizzo, which goes back to Greek skhedios, "done offhand". English sketch is the same word arriving by a different door, through Dutch rather than German.

The fence with the neighbours. Desegni is to draw properly, with intent to finish. Pentri is to paint. Skizi is neither: it is the fast, unfinished, working version, and the word carries that unfinishedness with it. A skizo that took three days is a joke rather than a sketch.