adjective

spontaneous

/spɑnˈteɪniəs/ · say it: span·TAY·nee·us

acting naturally without planning

In Personality & Character

In more detail

1. (adjective) happening or done without being planned or decided in advance

2. (adjective) (of a person) acting or speaking without careful thought; natural and unforced

Examples

1. The party started as a spontaneous gathering of friends in the park.
2. She gave a spontaneous laugh that made everyone smile.

How to use spontaneous

Spontaneous describes something occurring naturally without premeditation or careful planning, often implying an element of genuineness or authenticity. It carries positive connotations when applied to emotions or reactions (spontaneous laughter, spontaneous affection), but can be neutral in scientific or technical contexts (spontaneous combustion). Unlike 'impulsive,' which may suggest rashness, spontaneous often suggests authenticity and freedom from constraint.

Common phrases

spontaneous combustion
spontaneous reaction
spontaneous applause
spontaneous generation
act spontaneously
spontaneous decision

Synonyms

impromptu · unplanned · instinctive · unprompted · natural

Opposites

planned · deliberate · forced

Word family

spontaneously (adverb) · spontaneity (noun) · spontaneous (adjective)

A common mistake

Learners sometimes confuse spontaneous with spontaneous combustion or misuse it to mean merely quick or sudden, rather than genuinely unplanned.

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