As a noun terms
is .
As an adjective slummiest is
(slummy).
terms
English
Noun
(head)
Statistics
*
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slummiest
English
Adjective
(head)
(slummy)
slummy
English
Adjective
(er)
Like a slum; run-down, dirty, decrepit.
*2003 , (Alasdair Gray), ‘Miss Kincaid's Autumn’, Canongate 2012 (Every Short Story ), p. 745:
*:Cars and unemployment increased. Council houses took on a slummier look.