Prefix: mis-
Source: DfE, English Appendix 1: Spelling (2013) — Years 3–4 statutory prefix
Origin: Old English mis-, meaning "wrongly" or "badly"
Purpose: Guide to the prefix mis- for KS2 — meaning 'wrongly' or 'badly', word list with definitions, and morpheme-based practice activities.
What it means
mis- means wrongly or badly.
misspell = spell wrongly
misbehave = behave badly
misunderstand = understand wrongly
mislead = lead in the wrong direction
Where it comes from
mis- is an Old English prefix (like un-), meaning it has been in English for over 1,000 years. It attaches mostly to verbs to indicate that the action was done incorrectly. Like un-, it sounds native and informal.
The double letter trap
When mis- is added to a word beginning with s, you get double s:
- mis- + spell = misspell (two ss — one from mis-, one from spell)
- mis- + spend = misspend
- mis- + step = misstep
- mis- + state = misstate
But most mis- words have only one s:
- mis- + take = mistake (one s)
- mis- + lead = mislead (one s)
- mis- + behave = misbehave (one s)
The test: does the base word start with s? If yes → double s. If no → single s.
Statutory examples (Appendix 1, Y3/4)
| Word | Meaning |
|---|---|
| misbehave | behave badly |
| mislead | lead in the wrong direction; give false information |
| misspell | spell wrongly |
| misunderstand | understand incorrectly |
| mistrust | trust wrongly; be suspicious of |
| misuse | use incorrectly or badly |
| mismatch | match incorrectly |
| misplace | put in the wrong place |
| miscalculate | calculate wrongly |
| miscount | count incorrectly |
Morpheme matrix
| mis- | (nothing) | |
|---|---|---|
| -behave | misbehave | behave |
| -lead | mislead | lead |
| -spell | misspell | spell |
| -understand | misunderstand | understand |
| -take | mistake | take |
| -trust | mistrust | trust |
| -use | misuse | use |
| -place | misplace | place |
| -count | miscount | count |
| -read | misread | read |
Word family
misadventure · miscommunicate · misconduct · misfire · misfortune · misguide · mishap · misinform · misjudge · mismanage · mispronounce · misquote · misrepresent · mistreat · misprint · miswire
mis- vs dis-
Both can negate, but they differ in meaning:
| Prefix | Meaning | Example |
|---|---|---|
| mis- | done wrongly | misunderstand = understood wrongly |
| dis- | not / opposite | disagree = not agree |
Mislead = lead in the wrong direction. Disobey = not obey (not doing it wrongly — just not doing it).
Dictation sentences
- She did not mislead anyone — the directions were simply misunderstood.
- It was a mistake to misplace the key and then miscount the spares.
- He began to mistrust the advice after realising he had been misled twice.
- The children had misbehaved and the teacher had to misspell a word on purpose to catch their attention.
- A miscalculation in the mismatch of sizes caused a misuse of the space.
Source: DfE English Appendix 1: Spelling (2013). Etymology: Old English mis-, cognate with Dutch mis- and German miss-.