Collocations for unlikely - adj.

appear, be, look, sound
The takeover bid now looks unlikely to succeed.

become
remain, seem
make sth, render sth
consider sth, deem sth, find sth, think sth
He thought it unlikely that she would refuse.

extremely, fairly, very, etc.
exceedingly, highly, most
increasingly
a little, slightly, etc.
inherently (BrE)
An economic collapse is inherently unlikely.

Unlikely is used with these nouns:
alliance, candidate, explanation, figure, hero, saviour, scenario, setting, sight, situation, tale, venue, winner