adj

• (informal, somewhat derogatory) Of reduced intellectual capacity; not quick to comprehend.
  "Experienced classroom teachers are well acquainted with the attention-seeker, the shy girl, the aggressive boy, the poor concentrator, the slow student […]"
• (of a clock or the like) Behind in time; indicating a time earlier than the true time.
  "That clock is slow."
• (of a period of time) Not busy; lacking activity.
  "It was a slow news day, so the editor asked us to make our articles wordier."

verb

• (transitive) To make (something) run, move, etc. less quickly; to reduce the speed of.
  "slow the process"
• (transitive) To keep from going quickly; to hinder the progress of.
  "slow the traffic"
• (intransitive) To become slow; to slacken in speed; to decelerate.
  "After about a minute, the creek bed vomited the debris into a gently sloped meadow. Saugstad felt the snow slow and tried to keep her hands in front of her."

noun

• (music) A slow song.