Synonyms:
- ad infinitum,
- again and again,
- at a stretch,
- at attention,
- bolt upright,
- ceaselessly,
- connectedly,
- constantly,
- continually,
- continuously,
- cumulatively,
- cyclically,
- endlessly,
- endways,
- endwise,
- erectly,
- incessantly,
- interminably,
- monotonously,
- on a stretch,
- on and on,
- perennially,
- repetitively,
- right on end,
- round the clock,
- together,
- unbrokenly,
- unceasingly,
- unintermittently,
- uninterruptedly,
- unrelievedly,
- up,
- up on end,
- upright,
- uprightly,
- upstandingly,
- without a break,
- without cease,
- without stopping