existemi describes being struck with astonishment, and in two contexts being regarded as beside oneself.

The supplied verses most often use the term for amazement in response to striking events, words, signs, or reported news; it can describe those who are amazed or those who provoke that reaction. In two contexts, it characterizes a person as being beside oneself or out of sound mind.

1. Astonishment at striking events or words · dominant

   The term marks the response of people confronted by extraordinary events or speech: in Acts 10:45 the APB renders the circumcised believers' reaction to the Spirit's gift as being “amazed,” and in Acts 12:16 it renders the response to seeing Peter as “astonished.” It also occurs of causing such a reaction: in Acts 8:9 Simon is described as amazing the people, while in Acts 8:13 he is amazed as he observes signs and great powers.

   Acts 10:45Acts 12:16Acts 8:9Acts 8:13Mark 5:42Luke 2:47
2. Being regarded as beside oneself · occasional

   In Mark 3:21, the 3rd-person aorist active form occurs in the claim that he is “out of his mind.” In 2 Corinthians 5:13, the 1st-person plural aorist active form appears in the contrast between being “beside ourselves” for God and being of sound mind for others.

   Mark 3:212 Corinthians 5:13

In the Anselm Project Bible: Across the astonishment contexts, the APB uses “amazed,” “astonished,” “astounded,” and “marveled”; in the two other contexts it uses “beside ourselves” and “out of his mind.” These renderings reflect whole-verse translation rather than word-by-word alignment.