What does hate is a strong word mean?

hate is a strong word

Word Rarity Uncommon

Frequency: Zipf frequency 4.71 in modern English

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To express hatred — or to use the word hate — is a powerful action that should not be done or taken lightly.

"Little Mary Moreton was sitting by her mother’s side, hemming a pocket handkerchief. “How I do hate proud people !” suddenly exclaimed she, pulling through her needle with such violence as to break her thread. / Her mother looked up and said, smiling, “Hate is a strong word, Mary.” / “Well, mother, I can’t help it; there’s Julia Fearing —I cannot bear her.[…]"
""I hate Mary Hardcastle," said Violet. / "Why?" / "I don't know, but I hate her." / "Silly child!" said Rose; "she's always saying kind things to you." / "And always doing unkind ones," rejoined Violet, sharply. / "Hate is a strong word, Violet," said Blanche. / "Not stronger than I want," replied the high-spirited little girl."
"“Don’t you like smart little girls?” said Mrs. Tracy. / “No,” said Emma; “Jane Eaton was our smartest scholar, and we all hated her.” / “Hate is a strong word,” said Mrs. Tracy; “what did she do to incur your hatred?”"