To find the 10th term of the sequence described by the formula \( a_n = -8n - 3 \), we need to substitute \( n = 10 \) into the formula.
\[ a_{10} = -8(10) - 3 \]
Calculating this step by step:
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Multiply \( -8 \) by \( 10 \): \[ -8 \times 10 = -80 \]
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Now, subtract \( 3 \): \[ -80 - 3 = -83 \]
So, the 10th term of the sequence is \( \boxed{-83} \).