Highly
Highly adverb - To a great degree.
Usage example: though she didn't win, she was highly satisfied with her personal results for the marathon
Seriously is a synonym for highly in extremely topic. In some cases you can use "Seriously" instead an adverb "Highly", when it comes to topics like terrifically. informal substitute
Nearby Word: high
Seriously
Seriously adverb - To a great degree.
Usage example: that's some seriously good pie
Nearby Words: serious, seriousness
Mutual synonyms
Both words in one sentence
- On the other hand, several figures—including Niccolò Machiavelli and John Adams—have regarded him rather more highly, and studied him seriously.
Source: Creator / Xenophon -
Planetes being a highly realistic and mature series, this is one of those rare examples where this trope is played rather seriously.
Source: D-Cup Distress - Although there really was a guy (real name John Keehan) calling himself Count Dante, no one actually ever took his claims seriously, and it is highly suspected that sales of the booklet were immensely exaggerated.
Cite this Source
Seriously and Highly. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/highly/seriously
Highly & Seriously. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/highly/seriously>.
Seriously or Highly. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/highly/seriously.
Google Ngram Viewer shows how "highly" and "seriously" have occurred on timeline