The history of the language

softra - softost (soft) Sometimes suffixation was accompanied by /-
mutation of a root vowel: eald - ieldra - ieldest (old)
The adjective. Grammatical Categories
As stated before, the adjective in OE could change for
number, gender and case. Those were dependent
grammatical categories or forms of agreement of the adjective
with the noun it modified or with the subject of the sentence —
if the adjective was a predicative. Like nouns, adjectives had
three genders and two numbers.

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Weak and Strong Declension
As in other OG languages, most adjectives in OE could be
declined in two ways: according to the weak and to the strong
declension. 
The formal differences between the declensions, as well as
their origin, were similar to those of the noun declensions. 
The strong and weak declensions arose due to the use of several
stem-forming suffixes in PG:
vocalic a-, o-, u- and i- and
consonantal n-.
Accordingly, there developed sets of endings of the strong
declension mainly coinciding with the endings of a-stems of nouns for
adjectives in the Masculine. and Neuter. and of o-stems — in the
Feminine., with some differences between long-and short-stemmed
adjectives, variants with j- and w-, monosyllabic and polysyllabic
adjectives and some remnants of other stems.
Therefore the strong declension of adjectives is sometimes called the
"pronominal" declension.

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The weak form was employed when the adjective was preceded by a
demonstrative pronoun or the Gen. case of personal pronouns.
Singular
Strong (pure a- and o-stems)
M N F Weak
M N F
Nom. blind blind blind