The phrase "hadst life" can be interpreted as having lived or experienced life previously. Some synonyms for this term could include had existence, knew existence, or lived previously. Other related phrases might include had lived, had been alive, or had a past life. In many cases, these phrases are used to describe something that has come before, perhaps to emphasize the contrast between a past state and a current one. Ultimately, the choice of words will depend on context and the desired effect on the reader; for example, using more emotive or poetic language may be appropriate in certain situations.