1. Forcing forward or onward; impelling
   "an impellent power"; "an impellent cause"

See also: forceful, impel

• by choice
• by design
• by experimentation
• by far
• by fits and starts
• by George
• by gum
• by hand
• by heart
• by hook or by crook
• by inches
• by Jove
• by luck
• by machine
• by memory
• by nature
• by no means
• by right of office
• by rights
• by small degrees
• by the book
• by the bye
• by the day
• by the piece
• by the skin of your teeth