zweifle

Zweifle is a German verb form. It is the first-person singular present indicative of the verb zweifeln, meaning to doubt. The same string zweifle also appears as the third-person singular present subjunctive form (Konjunktiv I) in sentences such as “er zweifle,” and it is used in indirect speech and in formal writing. Because German verbs are inflected for person and mood, zweifle can occur in both indicative and subjunctive contexts.

The noun Zweifel, meaning doubt, is etymologically related and often discussed together with zweifeln. The relationship is that zweifeln is the verb built from Zweifel, with related meanings such as doubtful or doubtful in quality (zweifelhaft). In English-language usage, “zweifle” is generally seen only as a grammatical form, not as a separate concept, and there is no widely recognized topic or entity named “Zweifle” as a subject of study.

In German grammar, zweifle appears in everyday language, especially in quoted speech or reported statements. Language learners typically encounter its conjugation as part of mastering the verb zweifeln and related words such as Zweifel and zweifelhaft. The form illustrates how mood and person influence verb endings in German and how doubt is expressed in different grammatical contexts.