The bare infinitive is a grammatical term used to describe a verb that is not accompanied by an auxiliary verb or a modal verb. Some antonyms for the bare infinitive include the "full infinitive" or "to-infinitive," which is a verb accompanied by the word "to," such as "to eat," "to dance," and "to study." Another antonym is the "gerund," which is a verb form that functions as a noun and ends in "-ing," such as "eating," "dancing," and "studying." Other antonyms include the "past participle" and the "present participle," which are different verb forms used in the past and present tenses, respectively.