volatile person

[/ˈvɒlətaɪl ˈpɜːrsən/]
noun phrasepl: volatile people
pessoa volátil / pessoa instável
1. A person whose mood, behavior, or emotions change rapidly and unpredictably; someone prone to sudden outbursts or emotional instability
He's a volatile person who can be cheerful one moment and angry the next.
Ele é uma pessoa volátil que pode estar alegre num momento e furioso no próximo.
2. Someone who is unpredictable and potentially dangerous in social or professional situations
The volatile person in the meeting made everyone uncomfortable with his aggressive comments.
A pessoa volátil na reunião deixou todos desconfortáveis com seus comentários agressivos.
3. A person with an explosive temperament; quick to lose control or become agitated
You need to be careful around that volatile person; his temper is legendary.
Você precisa ter cuidado perto daquela pessoa volátil; o temperamento dela é lendário.
In Brazil, describing someone as 'volátil' is fairly direct and can be considered somewhat negative in professional settings. Americans often use euphemisms like 'passionate' or 'spirited' in workplace contexts to soften the criticism. The term is more commonly used in psychological or clinical discussions in both cultures.
NYC Slang
hothead / loose cannon / time bomb
Synonyms / Sinônimos
hot-headed persontemperamental personunpredictable personmoody personexplosive personunstable person
Antonyms / Antônimos
calm personstable personlevel-headed personcomposed personeven-tempered person

Regional Variations

General Brazilian
pessoa volátil / pessoa instável
Most common and formal usage
Rio de Janeiro
pessoa explosiva / pessoa temperamental
Colloquial usage emphasizing unpredictability
São Paulo
pessoa instável / pessoa impulsiva
Business/formal context preference
Portugal
pessoa volátil / pessoa inconstante
European Portuguese tends to use 'inconstante' for behavioral changes

Related Words

volatilitytemperamentemotional instabilityunpredictabilitymood swingshot-tempered

Related Idioms & Phrases

walking on eggshells around someone
a powder keg waiting to explode
a storm waiting to happen
unpredictable as the weather
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