In NMR of spins with I = 1/2 in an isotropic phase, it is demonstrated by simulation and expt. that virtually unlimited bandwidths can be decoupled effectively by using chirp pulses with linear frequency modulation for adiabatic inversion combined with phase-cycles and supercycles similar to those used in composite pulse decoupling. The av. radio-frequency amplitude required is modest compared to other techniques. In applications with inhomogeneous radio-frequency fields, as in magnetic resonance imaging and localized spectroscopy with surface coils, the radio-frequency amplitude can be apodized at the rising and falling edges of chirp pulses to improve adiabatic behavior. [on SciFinder (R)]