Examples of “spontaneous” in a Sentence

adj Happening or done without planning, on impulse.

• They decided on a spontaneous weekend trip to the coast.
• Her laugh was spontaneous, not forced.
• It was a spontaneous decision to adopt the puppy, made right there in the shop.

adj Occurring naturally, without external cause or human intervention.

• The fire started from spontaneous combustion in the hay bales.
• Scientists studied how the crystals formed through spontaneous reactions with no outside help.
• Spontaneous recovery is rare, but doctors do sometimes see an illness vanish unaided.