you can use it this way: 'when you stand before the crowd, don't be shy. speak out ans just let it be spontaneous.' meaning, whatever comes in your mind, speak it out. :)

Hello I think you can say that when you meet a new friend and you want to be direct with... It is a good way to know the reaction of the new friend.

Hi Mangoman. The dictionary defintion of 'spontaneous 'is as follows: # [adjective] happening or arising without apparent external cause; "spontaneous laughter"; "spontaneous combustion"; "a spontaneous abortion" Synonyms: self-generated # [adjective] said or done without having been planned or written in advance; "he made a few ad-lib remarks" Synonyms: ad-lib, unwritten # [adjective] produced without being planted or without human labor; "wild strawberries" Synonyms: wild Another way of expressing your question would be to say, just let it happen naturally.

Hello MANGOMAN, Someone is going to a meeting ,interview, public speech or any other occasion where this person is confronting a senior figure or a crowd of people. He/She asks you how to act showing some concern and anxiety. In an attempt to reassure this person and ease off their anxiety ,you tell them " Just let it be spontaneous" .You mean to tell them " No need to plan or arrange or even worry about this event ,just let it come naturally and act then as you feel and want to."