In order to call the reader´s attention, a very useful literary device is the RHETORICAL QUESTION. It is used with the aim of persuasion and emphasising on some point presented by the author. It has the grammatical structure of a question, but it does not require an explicit answer.
Answer:
Mystifying and unwavering
Explanation:
The woman can be described as mystifying because she had no shadow and her feet never touched the ground. She could also be described as unwavering because she continues on without being effected by the children. I'll include the definitions of each word so you can make sure my answer makes sense to you :)
Mystifying: Utterly bewildering or perplexing.
Unwavering: Continuing in a strong and steady way.
The answer to the question what does Whitman use to convey the passage of the time "There Was a Child Went Forth?" and the answer is "REPETITION".
As a matter of fact, there were phrases in the poem which are repeated six times.