not safe, strong, or steady
- He earned a precarious livelihood/living by gambling.
- She was in a state of precarious [=delicate] health.
- The government is in a precarious position. [=a dangerous position that must be dealt with carefully]
- The strong wind almost knocked him off of his precarious perch on the edge of the cliff.
- The vase was placed precariously close to the edge of the table.
- ненадежно, непрочно, в зависимости от обстоятельств, бездоказательно