The Only Use of
mercurial
in
Anne Frank, the Diary of a Young Girl - Definitive Edition
- I was suffering then (and still do) from moods that kept my head under water (figuratively speaking) and allowed me to see things only from my own perspective, without calmly considering what the others—those whom I, with my mercurial temperament, had hurt or offended—had said, and then acting as they would have done.†
p. 171.2
Definition:
tending to change quickly, frequently, and unpredictably