assiduous
/əˈsɪd͡ʒu.əs/adjective
assiduous is spelled A-S-S-I-D-U-O-U-S. The wrong spelling people search most is assidious: about 100 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 15 of all searches for the word. Assiduous is an adjective meaning “Hard-working, diligent or regular (in attendance or work); industrious”.
How many letters and syllables are in assiduous?
| Letters | 9: A-S-S-I-D-U-O-U-S |
|---|---|
| Syllables | 3 (from its American pronunciation) |
| In writing | about once in every 7 million words; the 79,518th most frequent word form |
| Wrong spellings searched | 1; the most searched, assidious, about 100 Bing searches a month (all of them) |
| Rhymes with |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026); rhymes and same-letter words are computed by PlainSpell from its own word list.
How do you spell assiduous?
Assiduous is spelled A-S-S-I-D-U-O-U-S. One wrong spelling is searched or written often enough to measure; together they are about 1 in 15 of the searches for assiduous in either form.
Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026). Wrong spellings are taken from Wiktionary entries tagged "misspelling" and its obsolete or nonstandard forms, Wikipedia's Lists of common misspellings and the codespell dictionary, then measured. The proofreader's marks show the change that corrects each one.
How common is assiduous?
Assiduous appears about once in every 7 million words in written English, the 79,518th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce assiduous?
- UK /əˈsɪdjuːəs/
- UK /əˈsɪd͡ʒuːəs/
- US /əˈsɪd͡ʒu.əs/
Assiduous has 3 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-assiduous.ogg, Wikimedia Commons (author and licence on each file's page).
What rhymes with assiduous?
One word on PlainSpell end in the same sounds as assiduous from its last stressed vowel (/ɪdʒuəs/):
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of assiduous
- more assiduous comparative
- most assiduous superlative
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does assiduous mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Hard-working, diligent or regular (in attendance or work); industrious.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Assiduous in Spanish, French, German and Portuguese
In the sense hard-working:
| Language | Words |
|---|---|
| French | assidu |
| German | fleißig, geflissen, gewissenhaft |
| Portuguese | assíduo, trabalhador, diligente |
| Spanish | asiduo |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does assiduous come from?
A learned borrowing from Latin assiduus, from assidere (“to sit down to”), from ad- (“to”) + sedere (“to sit”). Compare sedulous.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).