unlikely

Unlikely, a.

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. [Obs.] "The unlikely eld of me." Chaucer.

1 other Webster entry under this spelling

Unlikely, adv.

In an unlikely manner.

Shades of meaning

Fernald lists unlikely only as an antonym, under apparent, imminent, likely.

He lists it without comment; the entries above explain its neighbors.

none given