sound logic

Meanings

1. 1phraseuncountable

   Reasoning that is valid and rests on true or well-supported starting points.

   Grammar: Used as an uncountable phrase: we say 'the argument has sound logic', not 'a sound logic'.

   Patterns

   • sound logic behind something
   • there is sound logic in something
   • based on sound logic

   There is sound logic behind her decision to save money now.

   The report is based on sound logic, even if the numbers are rough.

   His conclusion follows from sound logic, so the debate is really about the facts.

2. 2phraseuncountable

   The quality of thinking clearly and sensibly in a particular situation.

   Grammar: Often used after verbs like show, use, or question when discussing someone's reasoning.

   Patterns

   • use sound logic
   • question the sound logic of something

   You need to use sound logic, not emotion, when you present the case.

   The judge questioned the sound logic of the earlier ruling.

Common combinations

sound logic behind

There is sound logic behind the new timetable.

based on sound logic

Her argument is based on sound logic and clear evidence.

use sound logic

Good lawyers use sound logic to persuade a jury.

the sound logic of

I admire the sound logic of his plan.

perfectly sound logic

That is perfectly sound logic, so I agree with you.

Synonyms and how they differ

good reasoning

Good reasoning is more general and can mean simply sensible thinking; sound logic stresses that the steps are valid and the premises true.

valid argument

A valid argument in logic only means the conclusion follows from the premises, even if the premises are false; sound logic also requires true premises.

Opposites

Word family

sound adjective

Reliable and based on good judgment, as in a sound decision.

logical adjective

Following clear, sensible rules of reasoning.

logically adverb

In a way that follows clear reasoning.

Commonly confused: sound logic or sound logics?

Practice

Make it your own

Write a sentence using “sound logic”, then check it and compare it with the examples above.

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