has been stiffing

• 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 stiff (3rd person singular).
  stiff

  adjective

  rigid or firm; difficult or impossible to bend or flex.

Related Words

• brisk
• excessive
• extreme
• hard
• harsh
• heavy
• rigorous
• sharp
• steep
• strict
• stringent
• strong
• vigorous