The boots may be nice, but they're 'worthless' if they don't fit you.
This land is 'worthless' [='useless'] for agriculture.
She's depressed and believes that she's 'worthless'.
(..) But her hands were still her hands. Still warm, and her nails were painted this dark blue-black color... And I willed myself to imagine a world without us... and what a worthless world that would be. You don't get tired of looking at her. You never worry if she's smarter than you... (..)2014 The Fault in Our Stars