Unappetizingly flavorless.
The diners were disappointed with the plain, insipid soup they were served.
Flat; lacking character or definition.
The textbook had a most insipid presentation of the controversy.
From French insipide, from Latin īnsipidus (“tasteless”), from in- (“not”) + sapidus (“savory”). In some senses, perhaps influenced by insipient (“unwise, foolish, stupid”).
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Lekhori