impenetrable - impossible to understand, unsustainable - that cannot continue at the same rate, immovable - fixed in place and impossible to move, hands-on - obtained by doing something, not by reading about it or by watching it done, intricate - having a lot of small parts that are arranged in a complicated or delicate way, invaluable - extremely useful, irreplaceable - too special, unusual, or valuable to replace with something or someone else, unrecognizable - very different to before, or changed very much, malleable - easily influenced, changed, trained, or controlled, inflammable - burns very easily, irreparable - impossible to repair or make right again, pliable - easily influenced and controlled by other people, inexplicable - unable to be explained or understood, illegible - impossible or difficult to read,

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