* Formal: The company's antiquated production methods made it difficult to compete in the modern market.
* Informal: My grandfather still uses an antiquated rotary phone, but I prefer my smartphone.
* Descriptive: The castle's antiquated armor collection offered a glimpse into the past.
* Negative: The government's antiquated laws needed to be updated to reflect modern society.
* Humorous: My aunt's fashion sense is so antiquated, she still wears shoulder pads.
The key is to use "antiquated" to describe something that is outdated, old-fashioned, or no longer relevant. It can be used in both formal and informal contexts.