zweifelst

Zweifelst is the second-person singular present tense form of the German verb zweifeln, which means to doubt or to be in doubt. It is used to express skepticism or uncertainty about a statement, claim, plan, or person. The verb commonly takes an object in the dative introduced by an, for example: Ich zweifle an deiner Behauptung; Wir zweifeln an den Ergebnissen. It can also be followed by a clause with daran or by a subordinate clause introduced with ob or dass, as in Ich zweifle daran, dass wir rechtzeitig ankommen or Ich zweifle daran, dass es funktionieren wird.

Grammatically, zweifeln is a regular verb. In the present tense the forms are: ich zweifle, du zweifelst, er/sie/es zweifelt, wir zweifeln, ihr zweifelt, sie/Sie zweifeln. The simple past is zweifelte (du zweifeltest, er zweifelte, etc.), and the perfect tense is formed with hat gezweifelt. The phrase zweifelst, the form you asked about, is specifically used when addressing someone directly in the present moment.

Usage notes include that Zweifel can carry a nuanced sense ranging from mild uncertainty to genuine skepticism. In journalism, science, or daily decision-making, zweifeln signals careful doubt rather than outright denial. Related terms include Zweifel (the noun meaning doubt) and skeptisch (skeptical). The expression often implies a request for justification or evidence before accepting a claim.

See also: Zweifeln, Zweifel, skeptisch, Vertrauen.