Comparative form of bland; more dull, tasteless, insipid, or uninteresting than something else.
From 'bland' (from Latin 'blandus' meaning soft and smooth, with semantic shift to 'mild' and 'boring') plus the comparative suffix '-er'.
The word 'bland' is funny—it started meaning soft and soothing in Latin, but became an insult meaning boring, showing how the same quality (lacking sharp edges) can be praise or criticism depending on context.
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