Synonyms for Spontaneously

Synonyms starting with letter O

• off the cuff

  voluntarily
• on impulse

  voluntarily, without being asked
• on the spur of the moment

  without being asked
• offhand
• of your own accord

  voluntarily
• on purpose
• on a dime
• on spur of moment
• openly
• off the top of head
• off-the-cuff
• ordinarily
• optionally
• off top of head
• on spur of the moment
• off your own bat

  voluntarily
• of your own volition
• of one's own accord

  without being asked
• off-hand
• off the top of your head
• on the spot
• organically
• off the hip
• on a whim
• originally
• overtly
• out of the blue
• out of nowhere
• offhandedly
• on instinct