Noun

• S: (n) drudgery, plodding, grind, donkeywork (hard monotonous routine work)
• S: (n) plodding, plod (the act of walking with a slow heavy gait) "I could recognize his plod anywhere"

Verb

• S: (v) slog, footslog, plod, trudge, pad, tramp (walk heavily and firmly, as when weary, or through mud) "Mules plodded in a circle around a grindstone"

Adjective

• S: (adj) leaden, plodding ((of movement) slow and laborious) "leaden steps"