Certainly Synonyms | Uses & Example Sentences

Certainly is an adverb that means “without doubt.” Certainly can modify adjectives, other adverbs, verbs, nouns, or entire phrases.

Some synonyms for certainly are:

QuillBot’s Paraphraser can help you find synonyms for “certainly” to reflect your intended meaning.

Certainly synonyms

Some synonyms for certainly are stronger matches than others. For example, “definitely” is a very strong synonym that can almost always be interchanged with certainly.

However, “for sure” or “hands down” are informal phrases, so they may not always be a great substitute for certainly, depending on the context of your writing.

Synonyms for certainly
Match Synonym Certainly example Synonym example
Strongest Definitely Count on me; I’ll certainly be there. Count on me; I’ll definitely be there.
Absolutely I can certainly help you with that project; just let me know when to start. I can absolutely help you with that project; just let me know when to start.
Positively The actor was certainly thrilled with his Oscar nomination. The actor was positively thrilled with his Oscar nomination.
Unquestionably Rose is certainly the best singer in our class. Rose is unquestionably the best singer in our class.
Undoubtedly There is certainly more work to be done before the launch. There is undoubtedly more work to be done before the launch.
Indubitably That film is certainly a classic. That film is indubitably a classic.
Strong Assuredly This new approach will certainly make the process more efficient. This new approach will assuredly make the process more efficient.
Inarguably This is certainly the best Thai food I’ve ever eaten. This is inarguably the best Thai food I’ve ever eaten.
Surely I can certainly understand why you’re feeling frustrated. I can surely understand why you’re feeling frustrated.
Clearly You’re certainly looking better than last week. You’re clearly looking better than last week.
Weak Hands down Jake is certainly my best friend. Jake is hands down my best friend.
For sure Certainly, you can have some cake. For sure, you can have some cake.
Note
“Indubitably” is a very formal, somewhat archaic word. You won’t hear it in common English nowadays, but you may see it in formal writing or old literature.

Frequently asked questions about certainly synonyms

What are some synonyms for certainty?

Some synonyms for the noun “certainty” include:

  • Assurance
  • Conviction
  • Confidence
  • Surety
  • Certitude
  • Indisputability
  • Undeniability
  • Guarantee

You can find more synonyms for “certainty” or synonyms for certainly with QuillBot’s free Paraphraser.

What’s the meaning of most certainly?

The superlative adverb “most certainly” means “most definitely” or “without a doubt or question.”

It conveys that something is undoubtedly true or will definitely happen.

For example, if someone asks you if you’ll be attending an event you wouldn’t miss for the world, you could reply, “Most certainly!”

A QuillBot Grammar Check can make sure you use phrases like this one correctly.

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Kate Santoro, BS

Kate has a BS in journalism. She has taught English as a second language in Spain to students of all ages for a decade. She also has experience in content management and marketing.