"plodding" in the noun sense
1. drudgery, plodding, grind, donkeywork
hard monotonous routine work
2. plodding, plod
the act of walking with a slow heavy gait
"I could recognize his plod anywhere"
"plodding" in the verb sense
1. slog, footslog, plod, trudge, pad, tramp
walk heavily and firmly, as when weary, or through mud
"Mules plodded in a circle around a grindstone"
"plodding" in the adjective sense
1. leaden, plodding
of movement) slow and laborious
"leaden steps"
Source: WordNet® (An amazing lexical database of English)
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