In a situation that is unknown or unfamiliar.
Dans une situation inconnue ou peu familière. (dans une situation inconnue ou peu familiere)
"The astronauts are heading into uncharted waters as they explore the unknown galaxy."
"Les astronautes s’aventurent dans des eaux inexplorées en explorant la galaxie inconnue." (les astronautes saventurent dans des eaux inexplorees en explorant la galaxie inconnue)
to make an effort to improve your performance
having sworn to tell the truth in court
to remain behind or hesitate to act
To continue practicing a custom so that it is not forgotten
to stay composed during difficult times
to be extremely surprised or frightened