Final answer:
In English, adjectives do not change form to indicate genitive singular, and the question's specific ending for genitive singular of irregular adjectives would depend on the particular language's rules. The suffix -ess is added to nouns in English to indicate a feminine subject, which can sometimes lead to the omission of a letter preceding the suffix.
Step-by-step explanation:
The formation of the genitive singular for irregular adjectives in a given language (not specified in the question). It asks for the appropriate ending that these adjectives take. In the context of English, to denote possession, the genitive singular of most nouns is formed by adding an apostrophe followed by the letter 's' ('s). However, English adjectives do not change form to indicate the genitive case as they would in some inflected languages. For irregular adjectives in other languages such as Latin, the ending might vary based on gender, case, and number of the nouns they modify, and knowledge of the specific language in question is required to provide a correct ending.
Turning to the subject of how suffixes affect the formation of words in English, the suffix -ess is often added to nouns to indicate a female subject. Sometimes the addition of -ess to a noun results in the deletion of a letter directly preceding the suffix, like in 'waiter' becoming 'waitress' where the 'e' is omitted. The suffix -ess transforms the noun into a feminine one, as in 'host' becoming 'hostess', which signifies a female host.