Intermediate (B1)
IPA: //ʌnˈsɜːrvɪsəbl//
KK: /ʌnˈsɜrvɪsəbl/
Definition
Not able to be used or operated; not functional.
Example
The equipment was declared unserviceable after the accident.
Conversation

I tried to fix my old bike, but it's completely unserviceable now.

That's too bad! How long have you had it?

I've had it for over ten years, but I guess it's time for a new one.

Yeah, sometimes it's better to get a new one than keep fixing an unserviceable bike.
Synonyms & Antonyms
Synonyms
inoperable
defective
faulty
Antonyms
functional
usable
serviceable
Root Explanation
Unserviceable → It is formed from "un-" (meaning not) and "serviceable" (from Latin "servire", meaning to serve, and the suffix "-able", meaning capable of). The word "unserviceable" means not capable of being used or served.
Memory Tip
Think of 'not' ('un-') being added to 'capable of serving' ('serviceable') — that's why unserviceable means something that cannot be used.
Visually Confused Words
inserviceable
serviceable
unswervable
serviceably
superserviceable
disserviceable
unsurveyable
unreviewable