Directions: Read the following passage and answer the question that follows.

Aunt Izzie was a small woman, sharp-faced and thin, rather old-looking, and very neat and particular about everything. She meant to be kind to the children, but they puzzled her much because they were not a bit like her when she was a child. Aunt Izzie had been a gentle, tidy little thing, who loved to sit as Curly Locks did, sewing long seams in the parlour, and to have her head patted by older people, and be told that she was a good girl; whereas Katy tore her dress every day, hated sewing, and did not care a button about being called "good", while Clover and Elsie shied off like restless ponies when anyone tried to pat their heads. It was very perplexing to Aunt Izzie, and she found it hard to quite forgive the children for being so "unaccountable", and so little like the good boys and girls in Sunday-school memoirs, who were the young people she liked best, and understood most about.

Which word in the passage means the same as 'very puzzling'?