Infernal path lacking love and depth (6)
I believe the answer is:
cursed
'infernal' is the definition.
(thesaurus)
'path lacking love and depth' is the wordplay.
'path' becomes 'course' (synonyms).
'lacking' indicates named letters should be taken away.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'and' means one lot of letters go next to another.
'depth' becomes 'd' (abbreviation in geometry).
'course' with 'o' taken out is 'curse'.
'curse'+'d'='CURSED'
(Other definitions for cursed that I've seen before include "Uttered profanities" , "Detestable" , "Hateful" , "Blasphemed" , "Damned" .)