This is the 4971st most frequent Portuguese word.
informal
Not formal; casual or relaxed in style or manner.
Here, 'informal' describes the friendly and relaxed nature of the interaction.
A conversa foi bastante informal, típica entre amigos.
The conversation was quite informal, typical among friends.
In this context, 'informal' refers to the meeting taking a relaxed or less structured format.
A reunião de trabalho foi mais informal do que o esperado.
The work meeting was more informal than expected.
Here, 'informal' pertains to the casual style of clothing, contrasting with the formal attire usually expected at such events.