From béal (“mouth”) + -ach (adjectival suffix).
béalach (genitive singular masculine béalaigh, genitive singular feminine béalaí, plural béalacha, comparative béalaí)
| Singular | Plural (m/f) | |||
|---|---|---|---|---|
| Positive | Masculine | Feminine | (strong noun) | (weak noun) |
| Nominative | béalach | bhéalach | béalacha; bhéalacha² | |
| Vocative | bhéalaigh | béalacha | ||
| Genitive | béalaí | béalacha | béalach | |
| Dative | béalach; bhéalach¹ |
bhéalach; bhéalaigh (archaic) |
béalacha; bhéalacha² | |
| Comparative | níos béalaí | |||
| Superlative | is béalaí | |||
¹ When the preceding noun is lenited and governed by the definite article.
² When the preceding noun ends in a slender consonant.
| Irish mutation | ||
|---|---|---|
| Radical | Lenition | Eclipsis |
| béalach | bhéalach | mbéalach |
| Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs. | ||