The phrase "worst singer" refers to someone who is not very good at singing compared to other people. They may have trouble hitting the right notes or have a bad tone. Full definition
The true story of the most famous bad singer of all time really comes to life on Blu - ray. (sassymamainla.com)
The brains of bad singers associate a note we hear with the wrong muscle movement in the voice. (discovermagazine.com)
I am a daughter, a mom, a sister, a tax payer, a dog walker, a garbage taker - outer, a complainer of heat waves (and cold snaps), a tryin» - not - to - eat - too - many - carbs - except - this - one last - plate - of - wings - and - fries and... a prayer, a reader of scripture, a tither, a really bad singer of really good blue grass gospel music, a cryin» - every - time - I - take - communion - and - sometimes - when - I - preach kind of gal. (rachelheldevans.com)