Etymology
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From dull + -some.
Adjective
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dullsome (comparative more dullsome, superlative most dullsome)
- (archaic) Characterised or marked by dullness.
1908, The New England Magazine, volume 43, page 176:Then suddenly a breath of air,
Unheralded, from who knows where,
Brings to my sense an odor faint,
Unrecognized yet eloquent,
And whiff! the dullsome street is gone — […]