unmistakably (`plain' is often used informally for `plainly')
Folklore, legends, myths and fairy tales have followed childhood through the ages, for every healthy youngster has a wholesome and instinctive love for stories fantastic, marvelous and manifestly unreal.
come up with (an idea, plan, explanation, theory, or principle) after a mental effort
Yet the old time fairy tale, having served for generations, may now be classed as "historical" in the children's library; for the time has come for a series of newer "wonder tales" in which the stereotyped genie, dwarf and fairy are eliminated, together with all the horrible and blood-curdling incidents devised by their authors to point a fearsome moral to each tale.
a flaw on a surface resulting when an applied substance does not adhere (as an air bubble in a coat of paint)
The definition is for "blister" as a noun but the example sentence is using it as a verb to describe the effect of the sun on the paint. The lack of color on the house matches the lack of joy in Aunt Em and Uncle Henry; this could be because they have blisters ("an elevation of the skin filled with serous fluid") from working so hard on the farm.
Once the house had been painted, but the sun blistered the paint and the rains washed it away, and now the house was as dull and gray as everything else.
Another definition of "hearty" is "showing warm and sincere friendliness"--this describes the mood surrounding the supper, because the Munchkins are all happy and thankful to Dorothy for freeing them from the Wicked Witch.
Dorothy ate a hearty supper and was waited upon by the rich Munchkin himself, whose name was Boq.
Little Toto, now that he had an enemy to face, ran barking toward the Lion, and the great beast had opened his mouth to bite the dog, when Dorothy, fearing Toto would be killed, and heedless of danger, rushed forward and slapped the Lion upon his nose as hard as she could
"Frail" is an adjective that can describe both physical and emotional natures. The Lion likes the physical frailty of flowers because 1) it doesn't scare him and 2) it reminds him of his emotional frailty (lack of courage).
"I always did like flowers," said the Lion. "They seem so helpless and frail.
The road was smooth and well paved, now, and the country about was beautiful, so that the travelers rejoiced in leaving the forest far behind, and with it the many dangers they had met in its gloomy shades.
Wanting to go home or to have a brain, heart, and courage does not seem like a silly thing, but thinking that a Wizard would give all that to them just for the asking does make Dorothy and her friends seem like other definitions of "idle" ("not in action or at work" and "lacking a sense of restraint and responsibility").
"He is powerful and terrible, and if you come on an idle or foolish errand to bother the wise reflections of the Great Wizard, he might be angry and destroy you all in an instant."
His first thought was that Oz had by accident caught on fire and was burning up; but when he tried to go nearer, the heat was so intense that it singed his whiskers, and he crept back tremblingly to a spot nearer the door.
unusually great in size or amount or degree or especially extent or scope
There was a rushing of many wings, a great chattering and laughing, and the sun came out of the dark sky to show the Wicked Witch surrounded by a crowd of monkeys, each with a pair of immense and powerful wings on his shoulders.
And when the tinsmiths came, bringing with them all their tools in baskets, she inquired, "Can you straighten out those dents in the Tin Woodman, and bend him back into shape again, and solder him together where he is broken?"
When he grew to manhood, Quelala, as he was called, was said to be the best and wisest man in all the land, while his manly beauty was so great that Gayelette loved him dearly, and hastened to make everything ready for the wedding.
having little elasticity; hence easily cracked or fractured or snapped
Another definition of "brittle" is "lacking warmth and generosity of spirit"--this could describe the emotional nature of the china animals and people; because they are so physically brittle, they are more likely to run away than welcome strangers into their country.
"That was too bad," said Dorothy, "but really I think we were lucky in not doing these little people more harm than breaking a cow's leg and a church. They are all so brittle!"
Dorothy's solemnity here is not the same as Uncle Henry's at the beginning, where he was described as "gray also, from his long beard to his rough boots, and he looked stern and solemn, and rarely spoke." Dorothy is temporarily sad that going home means leaving her newfound friends in Oz, while Uncle Henry is always sad that he is stuck in Kansas in a life filled with the same hard work every day.
Dorothy now took Toto up solemnly in her arms, and having said one last good-bye she clapped the heels of her shoes together three times, saying: "Take me home to Aunt Em!"