This is the 12116th most frequent Turkish word.
gösteremez
"Gösteremez" means "cannot show" in English.
Here, 'gösteremez' is used to denote inability or prohibition to show.
Bu şifreyi kimseye gösteremezsin.
You cannot show this password to anyone.
In this usage, 'gösteremez' reflects the incapability to demonstrate a quality.
Felaket anında soğukkanlılığını gösteremez.
During a disaster, he/she cannot demonstrate composure.
This sentence uses 'gösteremez' to indicate prohibition or prohibition due to an external rule.