What's the difference between fastish and fattish?

Fastish

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Definition:

• (a.) Rather fast; also, somewhat dissipated.

Example Sentences:

Fattish

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Definition:

• (a.) Somewhat fat; inclined to fatness.

Example Sentences:

• (1) Sitting in front of me on the bus: a fattish version of Che Guevara, in curls, beard and black beret, but with "nogodbutgod" printed on the beret.
• (2) I had a maths teacher – Froggie Dawson – he was a rather fattish man, with a corpulent body.