[adjective] -ier, -iest - not likely"Do you think she'll get the work done on time?" "Seems unlikely."It's pretty unlikely (that) they'll turn up now - it's nearly ten o'clock.He seems an unlikely-looking policeman (= He is not what I expect a policeman to look like).
UNLIKELY
Meaning of UNLIKELY in English
Cambridge English vocab. Кембриджский английский словарь. 2012