The ion cyclotron resonance heating of monster sawtooth (period greater than the energy confinement time) and pellet-fueled peaked-density profiles in limited discharges of JET Tokamak are studied. The monster sawtooth is a characteristic JET regime which is related to fast ions generated during the minority ion heating. In the ICRF heating of peaked-density profile discharges, the authors find typically that Ti0 is higher roughly by a factor of 2 and Te0 roughly by 35% at a fixed PTOT/ne0 when compared to nonpeaked profile cases. Te0 and Ti0 are central electron and ion temperatures, respectively, ne0 is the central electron density and PTOT is the total input power. The ion heating is improved in the pellet case, in part, due to a higher collisionality between the background ions and the energetic minority, but more significantly by a reduction of local ion energy transport in the central region. The transport-code simulation of these discharges reveals that there is a reduction of both chi e and chi i in the central region of the plasma in the ICRF heated peaked-profile discharges where chi e and chi i are the electron and ion heat conductivities, respectively.