Plodding
Part of speech: adjective
Definition: Progressing slowly and laboriously.
Part of speech: verb
Definition: To walk or move slowly and heavily or laboriously (+ on, through, over).
Example sentence: Maybe my plodding style has its benefits, I suppose.
Leaden
Part of speech: adjective
Definition: made of leadpertaining to or resembling lead; heavy, grey, sluggishdull; darkened with overcast; "a dark day"; "a dull sky"; "the sky was leaden and thick"