Webster's Revised Unabridged Dictionary · 1913

Unlikely

Unlikely , adjective

1.
Not likely; improbable; not to be reasonably expected; as, an unlikely event; the thing you mention is very unlikely.
2.
Not holding out a prospect of success; likely to fail; unpromising; as, unlikely means. — Hooker
3.
Not such as to inspire liking; unattractive; disagreeable. [Obsolete]
The unlikely eld of me. — Chaucer

Unlikely , adverb

In an unlikely manner.