In a bearish manner; with a gruff, rough, or pessimistic disposition or approach.
From 'bearish' plus the adverbial suffix '-ly,' forming the adverbial form to describe how an action is performed or a state exists.
Adverbs like this show how English builds meaning in layers—'bear' becomes 'bearish,' which becomes 'bearishly,' and with each suffix we're refining from a noun to a quality to describing how something happens.
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