This is the 13277th most frequent Swedish word.
tröga
The Swedish word "tröga" means "slow," "sluggish," or "resistant" in English, depending on context.
Here, "trög" is used to describe the difficulty or slowness in operating or responding of an object, the engine.
Motorn är trög att starta på morgonen.
The engine is sluggish to start in the morning.
In this context, "trög" refers to slow intellectual processing or understanding, applied to a person's mental grasp.
Han har en ganska trög förståelse för matematik.
He has a rather slow understanding of mathematics.
"Trög" in this example relates to physical sluggishness or heaviness, describing the state of one's body.