Without bitterness; lacking a bitter taste or bitter quality; sweet or pleasant.
From bitter + -less (a suffix meaning 'without' or 'lacking'). This straightforward formation creates the opposite of bitter, emphasizing the absence of bitterness.
A bitterless apple is sweet and enjoyable, but the word is rarely used because we just say 'sweet' instead. Interestingly, English prefers positive words (sweet, kind, happy) over negative ones (bitterless, unkindless, sadless) because our minds gravitate toward naming what exists rather than what's absent.
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