prehistoric - at a time before written history, misspell - to spell incorrectly, underground - beneath (under) the surface of the earth, precaution - an action taken in advance, usually for safety, unsafe - dangerous, risky, impossible - not able to happen; unreal, underline - to draw a line beneath, misplace - to put in the wrong place; to lose, impolite - showing bad manners; rude; discourteous, unsure - not certain; doubtful,

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