Depends if you mean the taste or the feeling.
Taste "The food tasted bitter"
feeling "he was bitter about the way he'd been treated."
The error in the sentence "it is bitter cold today" is a missing comma after "bitter." The correct phrasing should be "it is bitterly cold today," using the adverb "bitterly" to modify the adjective "cold." Alternatively, a comma could be added for a stylistic pause, making it "it is bitter, cold today," but the adverbial form is the more standard correction.
The word "erstwhile" is an adjective. An example of a sentence using the word would be: The erstwhile hero of the town was now a bitter old man.
Many folk say that lemons are bitter but I've always found them to be refeshing.
"The idealism of youth can be a bit wearying to those who have learned better from bitter experience."
There are two ways to use that word, taste and attitude. 1. I bit down into the fruit, but it had started to spoil and tasted bitter. 2. The woman was very bitter t'wards her husband for forgetting their anniversary. The butter tasted bitter.
quinine is bitter when tasted........
"You are the worst person I have ever known because you're as sour as a molding lemon!"
She looked grim and bitter as she recounted the events of the day.
This is an example of monumentally used in an alliteration sentence: Betty bought a bit of butter by that bit of butter was bitter so Betty bought a bit of monumentally butter.
The sweet but bitter fruit was sitting on the table, waiting to be eaten.
The competition in-between the two teams was bitter
Her breakup with Tim left her very bitter.Are you still bitter about your divorce?The coffee tasted bitter.Birds are attracted to bitter berries.