m- (kivumishi, ngeli ya 11)

In Swahili, many learners expect the adjective prefix to perfectly match the noun prefix. However, Classes 11 and 14 break this rule in the singular.

For Bantu-origin adjectives modifying a Class 11 noun (often called the U- class, which also includes Abstract Class 14), you must use:

• m- before consonant stems (e.g., -zuri → mzuri, -refu → mrefu)
• mw- before vowel stems (e.g., -ingine → mwingine, -eusi → mweusi)

Important Exceptions and Distinctions:

• Loan Adjectives Without Concord (mostly of Arabic origin, like safi or ghali) take no prefix at all: ukuta safi (a clean wall).
• Because the singular adjective uses m-, it looks identical to Classes 1 and 3 (e.g., mtu mrefu, mti mrefu). The difference appears in the plural! Class 11 plurals jump to Class 10 and take N-class agreement (ukuta mrefu → kuta ndefu). Note that Class 10 plural adjectives undergo N-class phonetic changes (e.g., the prefix N- + refu becomes ndefu). For vowel-stem adjectives in the plural, the prefix becomes ny- (e.g., ukuta mweusi → kuta nyeusi, ukuta mwingine → kuta nyingine). Class 11 nouns themselves can also undergo these exact same phonetic changes when forming their Class 10 plurals (e.g., ubao → mbao, ulimi → ndimi). Class 3 plurals jump to Class 4 (mti mrefu → miti mirefu). Note that while Class 14 shares this singular adjective agreement, it consists of abstract nouns which generally have no plural.
• While adjectives take m-/mw-, other modifiers (like possessives and demonstratives) and verbs DO follow the expected u-/w- agreement. A common trap is applying the mw- adjective rule to vowel-starting pronominal modifiers like -ote (all), -enye (having), and -enyewe (itself). Because they start with vowels, learners mistakenly write ukuta mwote instead of the correct ukuta wote. For example: Ukuta wangu mzuri umeanguka (My good wall has fallen).

One Common N-Class Exception:
The plural of an ordinary Class 11 noun commonly uses Class 10 adjective agreement. With -ema (good), that form is njema, not nyema: nyimbo njema (good songs). Do not extend the ny- pattern before every vowel without checking the stem.