Choose the perfect synonym or antonym for the word

Functional

/ˈfʌŋkʃənəl/

Useful and able to be used for a purpose or task.

Synonyms:

For some reason I can't bring any functional thoughts to mind.

A room must be aesthetically pleasing yet highly functional.

The software update made the app more functional and efficient.

Derived from the Latin word functionalis, meaning pertaining to functions, from functionem, meaning activity, performance.

17 mentions per 1 million words

Moderate

Hint: Frequency according to COCA