A writing instrument that transfers ink onto paper by means of a small rolling ball at the tip.
example
Kannst du mir bitte deinen Kugelschreiber leihen? Meiner schreibt nicht mehr.
Could you please lend me your ballpoint pen? Mine doesn't write anymore.
Usage tips
Compound word
The word is made up of 'Kugel' (ball) and 'Schreiber' (writer, from 'schreiben' — to write). So it literally describes a writing instrument that writes with a ball.
EXAMPLE
Für das Formular brauchst du einen Kugelschreiber, keinen Bleistift.
For the form, you need a ballpoint pen, not a pencil.
Colloquial form
In everyday speech, 'Kugelschreiber' (ballpoint pen) is very often shortened to 'Kuli' (ballpoint pen). This form is extremely common in spoken language.
EXAMPLE
Hast du mal einen Kuli für mich?
Do you have a pen for me?
Typical collocations
Common phrases are 'mit einem Kugelschreiber unterschreiben' (to sign with a ballpoint pen), 'der Kugelschreiber ist leer' (the ballpoint pen is empty/out of ink), or 'der Kugelschreiber schmiert' (the ballpoint pen smudges).
EXAMPLE
Dieser Kugelschreiber ist fast leer, die Farbe wird schon blass.
This ballpoint pen is almost out of ink; the color is already getting faint.
Compare with
near_synonym · confusable
Kugelschreiber vs Stift
pen / pin / apprentice
'der Stift' and 'der Kugelschreiber' are both writing instruments. But 'Stift' is more general and can mean many writing or drawing tools. 'Kugelschreiber' is more specific: it writes with ink that reaches the paper through a small ball at the tip. They can be confused because in everyday life people often simply say 'Stift', even when they actually mean a ballpoint pen. If you just need something to write with, 'Stift' sounds natural. If it is important that it is not a pencil or felt-tip pen, use 'Kugelschreiber'.
Kugelschreiber
Für das Formular brauche ich einen Kugelschreiber, weil Bleistift nicht erlaubt ist.
I need a ballpoint pen for the form because pencil is not allowed.
Stift
Bei der Arbeit liegt immer ein Stift neben dem Telefon.