What assumption is made about the speaker of the poem by Denise

Read the excerpt from the strange case of dr. jekyll and mr. hyde. from that time forward, mr. utterson began to haunt the door in the by-street of shops. in the morning before office hours, at noon when business was plenty, and time scarce, at night under the face of the fogged city moon, by all lights and at all hours of solitude or concourse, the lawyer was to be found on his chosen post. "if he be mr. hyde,” he had thought, "i shall be mr. seek.” how is mr. utterson characterized in the excerpt? as mysterious as depressed as determined as generous

Astudent wants to replace the underlined word to make the meaning more precise.which phrase would be the best replacement for the underlined phrase ?

Can someone explain this to me clearly plz