1) Accustomed 2) Accustomed occasionally 3) Got used to 4) Habituated 5) Hardened 6) Inured 7) Tough 8) Toughened 1) Inured 2) Toughened 
[adj] - made tough by habitual exposure
inured adjective made tough by habitual exposure; `hardened fishermen`; `a peasant, dark, lean-faced, wind-inured`- Robert Lynd; `our successors...may be graver, more inured and equable men`- V.S.Pritchett