In grammar, a verb is considered as transitive if the verb needs an object to express a complete idea. On the other hand, a verb is intransitive if it is not necessary to include an object after it and the sentence can be complete without having an object. Examples of transitive verbs include ride, hug or buy that need a noun after the verb, while others such as sleep, go or speak do not need an object. This means in the case of "My mother types well" this can be classified as an intransitive verb, because there is not an object after the verb "type" but only an adjective that describes the action, and also, despite there is no an object the sentence is complete.
Orwell uses the word "tractable", which means easy to control. The word "docile" most closely resembles this definition when compared to the other words
