Not natural or spontaneous
Lacking fluency or gracefulness
Digging a note pad out of her purse, she labored over a note.
I labored all day to look like this.
Its breathing was labored, and it sighed when they reached its chair.
She encircled his neck with one arm, noting that his breathing didn't seem at all labored as he carried her across the creek.
A quick glance back revealed Princess following, steam puffing from her mouth and nose with every labored step.