Unfriendly hotel's somehow welcoming one!
I believe the answer is:
hostile
'unfriendly' is the definition.
(associated in meaning)
'hotel's somehow welcoming one' is the wordplay.
'somehow' indicates anagramming the letters.
'welcoming' is an insertion indicator (in sense of 'inviting in').
'one' becomes 'i' (Roman numeral).
'hotels' with letters rearranged gives 'hostle'.
'hostle' placed around 'i' is 'HOSTILE'.
(Other definitions for hostile that I've seen before include "Unkind" , "Aggressive" , "Belligerent" , "The soil strangely is unfriendly" , "Inimical" .)