SPONTANEOUS in THE FOUNTAINHEAD

5 uses

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Definition

behaving in an instinctive, uninhibited manner

or:

happening naturally (without planning or external force)

He dismissed modern architecture, stating that: "So far, it has represented nothing but the whim of isolated individuals, has borne no relation to any great, spontaneous mass movement, and as such is of no consequence."
1.6 — Part 1 Chapter 6 (15% in)

It's just spontaneous.
3.1 — Part 3 Chapter 1 (17% in)
Suddenly, spontaneously, people were talking about Monadnock Valley.
4.1 — Part 4 Chapter 1 (61% in)
It was more or less spontaneous.
4.6 — Part 4 Chapter 6 (84% in)
The New Frontiers said something about regrettable excesses, but ascribed them to "spontaneous outbursts of justifiable popular anger."
4.15 — Part 4 Chapter 15 (56% in)

There are no more uses of "spontaneous" in The Fountainhead.

Typical Usage (best examples)

spontaneous used in The Fountainhead