mallaborema

This is the word to point at when somebody asks what Esperanto actually buys you. It is four pieces, every one of which you already know, and you have never had to learn it.

Read it from the inside out. Labor- is work, from labori. -em- means inclined towards, given to: parolema talkative, dormema sleepy, laborema hard-working. Mal- reverses whatever it is attached to, so mallaborema is disinclined to work. -a makes the whole assembly an adjective. Four morphemes, one meaning, and no dictionary lookup required.

Try it the other way and the machine keeps running. Mallaboremo is laziness as a quality. Mallaboremulo is a lazybones, a specific idle person. Mallaboreme is the adverb, doing something in a workshy manner. Each of those would be a separate memorised item in English and is free here.

The alternative is diligenta, which is borrowed whole and means hard-working - so the language offers you both routes to the same idea, the built one and the borrowed one. That is normal in Esperanto and not a defect. Native-feeling prose tends to reach for the built word when the opposition matters (laborema against mallaborema) and the borrowed one when it does not.