Which to use
“serious” is an adjective and “Sirius” is a name - they look or sound alike but fill different roles in a sentence.
- #836
- “serious” frequency rank
- #20,774
- “Sirius” frequency rank
- 21610
- confusion score
Side-by-Side Comparison
| Feature | serious | Sirius |
|---|---|---|
| Definition | Without humor or expression of happiness; grave in manner or disposition. | A telescopic binary star, visually the brightest star in the night sky, a part of the northern constellation of Canis Major (the Greater Dog), one of three stars in the Winter Triangle asterism. Long understood as a single extremely luminous white star, it was associated in ancient Egypt with the Nile flood and in Greek and Roman culture with the "dog days" of summer. |
Where the spellings diverge
Shared letters are muted; the letters that actually set serious and Sirius apart are highlighted. They share 5 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
serious and Sirius form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by 1 letter(s) in length - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 21610, derived from the frequency rank of both members and their visual similarity.
serious is recorded at frequency rank #836, classified as anadj, pronounced /ˈsɪə̯.ɹi.əs/. Sirius is at rank #20,774, tagged as aname, pronounced /ˈsɪɹi.əs/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 21610, this pair ranks #422,645 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Frequency comparison
Frequently Asked Questions
Can "serious" and "Sirius" be used interchangeably?
Remembering serious vs Sirius
The fastest way to pick the right one every time.
- Check the role first: if you need an adjective, it's “serious”; for a name, it's “Sirius”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “serious” entry
- Browse more pairs most likely to be confused. Most confusable