labored, laboured, strained(adj)

lacking natural ease

"a labored style of debating"

heavy, labored, laboured(adj)

requiring or showing effort

"heavy breathing"; "the subject made for labored reading"

laboured(Adjective)

Of an action that is difficult to perform.

At the end of the marathon, her laboured breathing told us she was exhausted.

laboured(Adjective)

Of writing or speech or similar, stilted or not natural due to too much effort being used in the production.