rock solid
"rock-solid" is a 9-letter English headword indexed on PlainSpell.
The verdict
“rock solid” is uncommon English (outside the top frequency list), classed as an adjective. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 10
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Physically very solid; very difficult to move.
| Property | Value |
|---|---|
| Headword | rock solid |
| Language | English |
| Part of speech | Adjective |
| Letters | 10 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “rock solid” sits in English frequency
Rare enough to double-check
rock solid is uncommon English outside the top frequency list, classed as anadjective. Rarity is why readers land here mid-draft. 2 senses are on record.
Zero misspellings are on record for rock solid in our index, since its letter sequence doesn't invite the usual edit-distance slips. No confusable counterpart is on file for this word, a sign it's visually distinctive enough not to be mixed up with another word.
No explicit etymology string is stored for this entry, so its spelling is best explained by sound-to-letter mapping rather than etymology. The correct English form is rock solid, spelled R-O-C-K- -S-O-L-I-D.
Definition
- 1Physically very solid; very difficult to move.
- 2Very strong and dependable.
Synonyms
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “rock solid”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is R-O-C-K- -S-O-L-I-D - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.