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We quantify the subcriticality of the bilaplacian in dimensions greater thanfour by providing explicit repulsivity/smallness conditions on complex additiveperturbations under which the spectrum remains stable. Our assumptions covercritical Rellich-type potentials too. As a byproduct we obtain uniformresolvent estimates in weighted spaces. Some of the results are new also in theself-adjoint setting.

Uniform resolvent estimates and absence of eigenvalues of biharmonic operators with complex potentials