There are 2 definitions of -ly in English:

-ly1

suffix

Forming adjectives meaning:
1Having the qualities of: brotherly rascally
2Recurring at intervals of: hourly quarterly

Origin

Old English -lic, of Germanic origin; related to like1.

Definition of -ly in:

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Word of the day flippant
Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude

There are 2 definitions of -ly in English:

-ly2

suffix

Forming adverbs from adjectives, chiefly denoting manner or degree: greatly happily pointedly

Origin

Old English -līce, of Germanic origin.

Definition of -ly in: