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- Sickly; peaked.
- 1956 , Johanna Spyri, translated by Eileen Hall, Heidi, page 111:
- Her appetite did not improve, however, and she looked very thin and peaky.
- Characterised by peaks.
- 1994, John S. Hares, Duncan Royle, Measuring the value of information technology, page 176:
- A wide spread of possible outcomes will give a relatively flat distribution and so indicate a risky project. A narrow spread of results will give a very peaky graph and indicate a low risk project.