The word insipid corresponds to lacking flavour and being weak or tasteless. It can also be used to denote lacking interest or vigour.
Origin: The word, which has been in usage since 1610s, comes from French insipide, from Latin inspidus meaning tasteless.
The figurative meaning of being uninteresting or dull was first recorded in English in the 1640s, probably from Medieval Latin. The word saw a rapid decline in usage in the 19th Century, but has maintained that level since then.
Usage: Despite an insipid performance in first half of the play, the children more than made up in the second half to make it an enjoyable show overall.
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