Hidden vs. conclead

[Tarana]

Test No. incompl/inter-6 "The Farmer and his Sons", question 4

He told them that there was a ......... treasure in the land and they would have to look for it when he had gone.

(a) unseen
(b) hidden
(c) concealed
(d) obscured

Test No. incompl/inter-6 "The Farmer and his Sons", answer 4

He told them that there was a hidden treasure in the land and they would have to look for it when he had gone.

Correct answer: (b) hidden
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Why hidden? Conclead has the same meaning.

[Alan]

Good question - thank you. Hidden means it has been put out of sight deliberately. Concealed refers to something that cannot be seen immediately as in a sign on the road that says concealed entrance which you could easily not see because it is on a bend in the road.
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English as a Second Language
You can read my ESL story Phrasal Verbs/take