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Insipid
Beyond Taste
When describing food, 'insipid' implies it's so lacking in flavor it doesn't stimulate the senses. Not just mildly bland. 
Negative Connotation
'Insipid' often carries a negative feeling, suggesting disappointment or dissatisfaction with a lack of taste. 
Mildly Polite Criticism
Use 'insipid' to diplomatically criticize food when you want to be kinder than saying 'bad' or 'awful'. 