Synonyms for Laboured (same or very similar meaning)
WordNet sense 1 (lacking natural ease):
labored, strainedWordNet sense 2 (lacking grace or skill in manner or movement or performance):
awkwardWordNet sense 3 (requiring or showing effort):
heavyWordNet sense 4 (requiring great physical effort):
effortfulFrom the ODE community, based on WordNetadd/edit