Lower (6)
(Other definitions for demean that I've seen before include "Cause to lose respect" , "Lower in dignity or reputation" , "Belittle; degrade" , "Stoop" , "Lower in dignity or respect" .)
'lower' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sadder that I've seen before include "Less happy" , "more blue" , "Gloomier" , "Unhappier" , "extra-blue?" .)
'lower' is the definition.
(as in nether regions)
This is all the clue.
(Other definitions for nether that I've seen before include "Lower, like regions or garments" , "Underground" , "These regions are hell, the underworld" , "Located below" , "North European country" .)
'lower' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for decrease that I've seen before include "Deminish, lessen" , "Make smaller or fewer" , "Peter out" , "Dock" , "Plummet" .)
'lower' is the definition.
(depressing is a kind of lowering)
This is the entire clue.
(Other definitions for depress that I've seen before include "Bring down" , "Push down or dispirit" , "Make miserable or lower" , "Make sad or gloomy" , "Sadden" .)
'lower' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for let down that I've seen before include "Lower" , "Disappointment < lowered" , "deflating" , "Leave in the lurch" , "Fail to meet expectations of others" .)