Bitterness (n.) is a confusion of the cardinal points of tasting. With no north to reckon by, one bite of bitter fruit makes everything afterward taste the same.
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Bitterness (n.) makes all the other tastes recoil, so that we taste from the throat up instead of from the mouth down. Creating a palatal inversion—the tongue tastes by gliding along the food, wary of being bitten.
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Bitterness (n.) wrinkles our sense of taste. The tongue has to stretch out nimbly to straighten itself.
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Bitterness (n.) is sour sweetened from within; Bittersweet is sour sweetened from the outside.
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Bitterness (n.) is the crossroads of all extreme tastes.