General:
* Handy
* Convenient
* Efficient
* Powerful
* Fast
* Modern
* Compact
* Versatile
* Essential
* Practical
Descriptive:
* Stainless steel
* Sleek
* Stylish
* Large
* Small
* Built-in
* Countertop
* Digital
* Analog
Evaluative:
* Reliable
* Durable
* Affordable
* High-quality
* High-powered
* Overpowered
* Outdated
* Loud
* Noisy
Figurative:
* Blazing (referring to the speed)
* Whizzing (referring to the sound)
* Buzzing (referring to the sound)
* Magic (referring to its ability to heat food quickly)
The best adjective for "microwave" depends on the specific context and what you want to emphasize.