Verb
To compose, recite, or sing extemporaneously, especially in verse; to extemporize; also, to play upon an instrument, or to act, extemporaneously.
To bring about, arrange, or make, on a sudden, or without previous preparation.
To invent, or provide, offhand, or on the spur of the moment; as, he improvised a hammer out of a stone.
To produce or render extemporaneous compositions, especially in verse or in music, without previous preparation; hence, to do anything offhand.
Source: Webster's dictionaryLife is a lot like jazz - it's best when you improvise. George Gershwin
In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed. Charles Darwin
More of me comes out when I improvise. Edward Hopper
Only someone who is well prepared has the opportunity to improvise. Ingmar Bergman
To succeed, planning alone is insufficient. One must improvise as well. Isaac Asimov
And by the way, everything in life is writable about if you have the outgoing guts to do it, and the imagination to improvise. The worst enemy to creativity is self-doubt. Sylvia Plath