relaxed
adj
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Without physical tension; in a state of equilibrium.
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Made more lenient; less strict; lax.
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Free from tension or anxiety; at ease; leisurely.
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Of a muscle: soft, not tensed.
with one's back up against the wall
How often have the words relaxed and with one's back up against the wall occurred in a corpus of books? (source: Google Ngram Viewer )