Synonyms for the phrase "bizarre sentimentality" could include strange nostalgia, odd affection, peculiar tenderness, or unusual emotionality. These phrases all suggest a mix of strange or unusual feelings combined with a sense of sentimentality or fondness. Other possible synonyms might include quirky yearning, unconventional reverie, eccentric attachment, or atypical fondness. Whatever words are used, the idea of combining strange or unusual feelings with a strong sense of sentimentality creates a unique and identifiable emotional state that may be experienced by some individuals in various situations or circumstances.