Shall we gather strength by irresolution and inaction? shall we acquire the means of effectual resistance by lying supinely on our backs and hugging the delusive phantom of hope, until our enemies shall have bound us hand and foot? what is the meaning of the word supinely as it is used in this selection?

marked by or showing lethargy, passivity, or blameworthy indifference

Explanation:

Supine means, among other things, 'exhibiting passivity'; therefore, 'lying supinely' would be correctly defined as 'showing lethargy, passivity, or blameworthy indifference'.

The supporting evidence in the text:

The phrase lying supinely on our backs is linked by the coordinating conjunction and, (which is used to join equal ideas), to the following: hugging the delusive phantom of hope, until our enemies shall have bound us hand and foot. It definitely suggests passivity and indifference.  

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