強か

Etymology 1
Compound of.

Appears in texts from the late 900s.

Adjective

 * 1) resilient, tough

Adverb

 * 1) a lot, in very large numbers or amounts
 * 2) severely, extremely, terribly

Usage notes
Found both as a standalone adverb, and followed by adverbial particle.

Etymology 2
Derived via fusion of the adverbial form tsuyoku of regular -i adjective + classical copular verb.

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