insipid

From French insipide, from Latin īnsipidus (“tasteless”), from in- (“not”) + sapidus (“savory”). In some senses, perhaps influenced by insipient (“unwise, foolish, stupid”).

• (UK, US) IPA^(key): /ɪnˈsɪp.ɪd/

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insipid (comparative more insipid, superlative most insipid)

1. Unappetizingly flavorless.

   Synonyms: tasteless, bland, vapid, wearish

   The diners were disappointed with the plain, insipid soup they were served.

2. Flat; lacking character or definition.

   Synonyms: boring, vacuous, dull, bland, characterless, colourless

   The textbook had a most insipid presentation of the controversy.

3. (Can we verify⁽⁺⁾ this sense?) Cloyingly sweet or sentimental.
   • 1972, Peter A. Tasch, The Dramatic Cobbler: The Life and Works of Isaac Bickerstaff, →ISBN, page 80:

     Sentiment, insipid sentiment, gives it what colouring it has.

   Synonyms: corny, fatuous

   Greeting cards contain some of the most insipid words ever written.

• insipient

• “insipid” in Lexico, Dictionary.com; Oxford University Press.
• insipid at OneLook Dictionary Search