Describes something literally or figuratively disgusting or unbearable
Encoding Strategies:
linguistic
mnemonic

a pest
a bug or vermin
+
-oso
full of
(adjective suffix)
Apestoso means stinky and sounds like a pest0 with the suffix -oso1 (full of1), since something full of pests would smell bad.
apestoso
stinky, smelly, foul-smelling
When something has a strong, unpleasant smell or reeks badly.
- Esos zapatos están apestosos = Those shoes are stinky
- El cubo de basura huele apestoso = The trash can smells foul
disgusting, awful, annoying (colloquial)
Just as something stinky is repulsive to the nose, something that's repulsive is annoying or awful.
- Qué comportamiento más apestoso = What disgusting behavior
- Esa película fue apestosa, no la recomiendo = That movie was awful, I don't recommend it