A mimetic adverb describing trudging or plodding along with heavy, listless footsteps (e.g., 'to walk dejectedly').
雨に濡れて傘もなく、彼はとぼとぼ家に帰った。
Soaked by the rain without an umbrella, he trudged home dejectedly.
試験に落ちた彼女はとぼとぼと校舎を出た。
Having failed the exam, she plodded out of the school building.
夜遅く、老人がとぼとぼと公園のベンチに向かった。
Late at night, an old man slowly trudged toward a bench in the park.