improvised

"We prepared the spacecraft for takeoff."

"My friend told me there was something in the box, but I didn't know what it was yet. "

"You can create the color orange by mixing yellow and red."

"The pianist played an impromptu during the family gathering, creating a cheerful atmosphere. "

"Many animals fear fire by instinct."

"Without knowing the exact amount of money needed for the trip, all we could do was guesswork. "

"He played a quick improvisation on the keyboard."

"To proceed on a journey."

"He was a slow and careful driver."

"After weeks of hard work, I invented a new way to alphabetize matchbooks."

"Her acceptance speech was so heartfelt and moving because it was completely unrehearsed. "

"Imagination is one of the most advanced human faculties."