[1] : The Collaborative International Dictionary of English v.0.48

laboured \laboured\ adj.
   1. same as labored; -- british spelling chiefly british

   syn: graceless, labored, strained.
        wordnet 1.5
see also:
labored 

[2] : WordNet (r) 2.0

laboured
     adj 1: lacking natural ease; "a labored style of debating" syn: labored,
             strained
     2: requiring or showing effort; "heavy breathing"; "the subject
        made for labored reading" syn: heavy, labored
see also:
labored strained heavy 

Laboured >> L Words
Laboured, definition of term: Laboured
laboured_pag1.html