restless mind

Translations
беспокойный ум
Someone has a restless mind that never stops thinking.
У кого-то беспокойный ум, который никогда не перестает думать.
Definitions
A state of mental agitation or unease characterized by an inability to relax or focus, often leading to constant thoughts or worries.
Words
restless

adjective
беспокойный
mind

noun
ум