Another Word for Key: 15 Synonyms with Examples
As an adjective, “key” means of crucial importance. It is compact and popular in business writing, so it is easy to overuse.
As an adjective: of great importance
As a noun: a means of understanding or achieving something
- answer
- solution
- secret
- clue
- explanation
- means
Need a different word?Look up any word in the synonym finder →
How they differ
Synonyms share a meaning, not always a tone. Here is when to pick each of the main options.
- crucial
- Stronger; something an outcome depends on.
- central
- At the core of a subject or plan.
- pivotal
- A turning point that other things depend on.
- fundamental
- Forming a necessary base or foundation.
- secret
- As a noun, informal: “the secret to good bread”.
Example sentences
- crucial: Funding is crucial to the project's survival.
- central: Fairness is central to the new policy.
- pivotal: The election was a pivotal moment for the region.
- fundamental: There is a fundamental flaw in the argument.
- secret: The secret to crisp roast potatoes is hot fat.
Opposite of key
- minor
- unimportant
- peripheral
- secondary
More from WordNet
Less common or more specialised words WordNet lists for other senses of “key”. Check the meaning before you use one.
adjective: cardinal, primal
verb: identify, discover, distinguish, describe, name
noun: tonality
WordNet 3.1, Princeton University. Used under the WordNet licence.
Frequently asked questions
What is another word for “key”?
The most useful alternatives are “crucial”, “vital”, “essential”, “central”, “main”. For the main sense (of great importance), “crucial” is usually the closest swap.
What is the difference between “crucial” and “central”?
crucial: Stronger; something an outcome depends on. central: At the core of a subject or plan.
What is the opposite of “key”?
Common antonyms are “minor”, “unimportant”, “peripheral”, “secondary”.