Spontaneous

Spontaneous means something unplanned or unexpected occurs.

There was a spontaneous applause from the crowd listening when I finished my speech.

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hippopotomonstrosesquippedaliophobia

This is a phobia when people have a fear of big words. So, it must be awful to read this if you do have this phobia.

Doctor: I apologize because this may be hard for you to hear if you do have this diagnosis.
Patient: What is it?
Doctor: You have hippopotomonstrosesquippedaliophobia.

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