monopersonal

English

mono- +‎ personal

monopersonal (not comparable)

(grammar) Having only one grammatical person.
- 2000, G. E. Booij, Christian Lehmann, Joachim Mugdan, Morphology, Walter de Gruyter, page 650:
  Grammars of several languages traditionally list a subcategory of monopersonal verbs that occur only in the third-person but not in the first or second. Some such verbs do not even occur in the third-person plural. For instance, Finnish has several subtypes of monopersonal verbs, here all listed in the third person singular (marked by lenghthening of the stem-vowel): […]

having one grammatical person