having no beneficial use or incapable of functioning usefully
"a kitchen full of useless gadgets"
"she is useless in an emergency"
Without use or possibility to be used.
"The broken ladder was completely useless because it would not support anyone's weight."
In plain English: Useless means something that does not work well enough to be useful at all.
"The old battery in my phone is completely useless and won't hold any charge anymore."
The word useless is formed by combining use with the suffix -less, meaning without or lacking something. It entered English as a straightforward compound describing anything that has no utility.