strenuous

    adjective
  1. [energetic] forçut, robust, vigorós.
  2. [tough] sòlid, ferm, resistent.
  3. [exhausting] esgotador.
  4. [opposition, etc.] tenaç.
  5. [exercise] dur, fort.
  6. strenuous life vida dura.
  7. strenuous profession professió difícil, ofici penós.
  8. to make strenuous efforts to + infinitive esforçar-se terriblement per a + infinitiu, escarrassar-se per a + infinitiu.
  9. to offer strenuous opposition oposar-se radicalment (to a), presentar una forta oposició (to a).