Etymology
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From length + -some.
Adjective
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lengthsome (comparative more lengthsome, superlative most lengthsome)
- Of significant length; long; lengthy.
1869, The New Eclectic Magazine, volume 5, page 341:[…] and of course I planned a number of schemes for making it, when the time should come, duly effective and elegant. I pined to learn something of her during the lengthsome days of absence.