Adjective ending in -ly
They may be confused with adverbs, which usually end in -ly. Students may try to form adjectives by removing the -ly.
A minority of these may be changed into adverbs by changing the -ly ending to -lily, e.g. friendly --> friendlily, ghostly--> ghostlily, silly--> sillily, ugly --> uglily, wily --> wilily, etc. Some of these may have marginal attestation. Particularly in informal speech, some may be used without change as bare adverbs, e.g. "winning ugly". Otherwise, either an adverbial is needed, e.g. "in a friendly way", or circumlocution is required, e.g. instead of "friendlily" use its synonym "amicably". Basically, the whole thing is a bit of a confusing mess.
Time period nouns with -ly, (definite frequency adverbs) e.g. hourly, daily, weekly, fortnightly, monthly, quarterly, yearly, annually, are all adjectives that may also be used as adverbs without change (i.e. bare adverbs).