has been impairing

• present perfect progressive

  present perfect progressive

  Used to describe an action that began in the past, has continued continuously, and is still in progress.

  of impair (3rd person singular).
  impair

  verb (used with object)

  to make or cause to become worse; diminish in ability, value, excellence, etc.; weaken or damage.

Related Words

• blunt
• damage
• debilitate
• decrease
• destroy
• diminish
• hurt
• lessen
• mar
• prejudice
• reduce
• spoil
• tarnish
• undermine
• weaken
• worsen