On many prominent accounts, moral praise- and blameworthiness depend on the quality of will an agent manifests in their action. This paper draws attention to a pertinent but overlooked phenomenon: the manifestation of commendable and objectionable qualities of will in an action at once. By showing that all the manifested qualities of will have an effect on the agent's praise- and blameworthiness (i.e., on their action's moral worth), it is argued that quality of will theories need to provide an account (...) of this effect. An account according to which the manifested degrees of qualities of will cancel each other out and the praise- or blameworthiness is determined by the remaining quality of will is discussed and dismissed. Finally, it is argued that agents who manifest objectionable and commendable qualities of will at once are simultaneously both praise- and blameworthy for their actions. Actions can thus have ambivalent moral worth. (shrink)