That is a pronominal adjective, not compared; standing for that method, in the third person, singular number, neuter gender, and nominative case. [See OBS. 14th,] 1.  An adjective is a word added to a noun or pronoun, and generally expresses quality. 2.  A pronominal adjective is a definitive word which may either accompany its noun or represent it understood. 3.  The third person is that which denotes the person or thing merely spoken of. 4.  The singular number is that which denotes but one. 5.  The neuter gender is that which denotes things that are neither male nor female. 6.  The nominative case is that form or state of a noun or pronoun, which usually denotes the subject of a finite verb.

Of is a preposition. 1.  A preposition is a word used to express some relation of different things or thoughts to each other, and is generally placed before a noun or a pronoun.

Which is a pronoun. 1.  A pronoun is a word used in stead of a noun.

The is the definite article. 1.  An article is the word the, an, or a, which we put before nouns to limit their signification. 2.  The definite article is the, which denotes some particular thing or things.

Careless is a common adjective, compared by means of the adverbs; careless, more careless, most careless; or, careless, less careless, least careless. 1.  An adjective is a word added to a noun or pronoun, and generally expresses quality. 2.  A common adjective is any ordinary epithet, or adjective denoting quality or situation. 3.  Those adjectives which may be varied in sense, but not in form, are compared by means of adverbs.

Are is a verb. 1.  A verb is a word that signifies to be, to act, or to be acted upon.

Least is an adverb. 1.  An adverb is a word added to a verb, a participle, an adjective, or an other adverb; and generally expresses time, place, degree, or manner.

Fond is a common adjective, compared regularly, fond, fonder, fondest; but here made superlative by the adverb least. 1.  An adjective is a word added to a noun or pronoun, and generally expresses quality. 2.  A common adjective is any ordinary epithet, or adjective denoting quality or situation. 8.  The superlative degree is that which is most or least of all included with it.

Teach is a verb. 1.  A verb is a word that signifies to be, to act, or to be acted upon.

Learnedly is an adverb. 1.  An adverb is a word added to a verb, a participle, an adjective, or an other adverb; and generally expresses time, place, degree, or manner.

Rebuking is a participle. 1.  A participle is a word derived from a verb, participating the properties of a verb, and of an adjective or a noun; and is generally formed by adding ing, d, or ed, to the verb.