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a suggestion or thought about something that we could do

idée

a piece of evidence that leads someone toward the solution of a crime or problem

indice

from one's memory, without spending time to carefully consider or think

comme ça, sans réfléchir, de but en blanc

without any preparation or prior thought

spontanément, au pied levé

to know about somebody or something because one has received information or news about them

entendre parler de

to be well-informed about or completely familiar with something

feeling confident about something being correct or true

certain

(of a person) having no doubt about something

positif

by relying only on one's memory

to have very good knowledge or understanding about someone or something

to a degree that is very little and close to nothing

difficult to see, hear, smell, etc.

faible, léger

feeling completely sure about something and showing that you believe it

certain