The superlative form meaning most resembling or full of hackles; extremely rough or coarse.
Superlative form of 'hackly,' formed with the suffix '-iest' following standard English patterns for adjectives derived from nouns.
The superlative 'hackliest' is rarely used but perfectly logical—English allows us to build comparative chains for almost any observable quality, which is why Shakespeare invented hundreds of words we still use today!
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