Potential answers for "Difficult and tiring"

⭐⭐⭐⭐ ARDUOUS
⭐⭐⭐ SLOG
⭐⭐ TRUDGES
⭐⭐ SOURINGON
⭐⭐ TREK
⭐⭐ LABOR
⭐⭐ NOAIR
⭐⭐ RATRACE

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