Final answer:
The word 'unscrupulous' is most related to individuals showing deceitful behavior and lacking moral principles, aligning with the word chain 'liar - cheater - swindler'.
Explanation:
The word unscrupulous is best associated with individuals who exhibit deceitful behavior or lack moral principles. In the provided word chains, the chain that aligns most closely with unscrupulous is A. liar – cheater – swindler, as all these terms imply a lack of honesty and ethical standards.
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