insurmountable: disadvantage

Choices
impermeable:water
indomitable:defeat
interminable:tedium
inevitable:drawback
insuperable:barrier

and a sentence to prove

How to solve analogies:
http://www.teachervision.fen.com/vocabulary/reading-comprehension/6697.html

Use with http://www.onelook.com

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There are a couple of analogies on my home work that i need help with the first one is trees leaves states and there are six letters in all and the third letter is a t