This is the 230th most frequent Portuguese word.
boa
"Boa" means "good" or "kind" in English, and it can also refer to a type of large snake or a feathered scarf, depending on context.
In this sentence, 'boa' is used as an adjective to describe the noun 'sombra', indicating its desirable quality.
Para um dia quente, uma sombra boa é essencial.
For a hot day, a good shadow is essential.
Here, 'boa' characterizes the noun 'piada', suggesting that the joke was entertaining or humorous.
Ela contou uma boa piada na reunião.
She told a good joke at the meeting.
In this case, 'boa' modifies 'oportunidade', denoting that the opportunity was advantageous or beneficial.