Using 'as lief' strengthens expression of preference, almost poetic. I would as lief not attend the ceremony if possible.
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Antique Charm
'Lief' can add an old-fashioned, charming tone to speech or writing. She said she'd as lief walk through the gardens, remarking on their timeless beauty.
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Preceded by 'Would'
'Lief' is typically used with 'would' indicating a conditional or hypothetical wish. I would as lief read by candlelight, like in ancient times.