Wordnet 3.0
ADJECTIVE (2)
1. 
 (of weather or climate) severe; 
2. 
 used of persons or behavior; 
 showing no clemency or mercy; 
- Example: "the harsh sentence of an inclement judge"
The Collaborative International Dictionary of English v.0.48:
Inclement \In*clem"ent\, a. [L. inclemens; pref. in- not +
   clemens mild: cf. F. incl['e]ment. See Clement.]
   [1913 Webster]
   1. Not clement; destitute of a mild and kind temper; void of
      tenderness; unmerciful; severe; harsh.
      [1913 Webster]
   2. Physically severe or harsh (generally restricted to the
      elements or weather); rough; boisterous; stormy;
      rigorously cold, etc.; as, inclement weather. --Cowper.
      [1913 Webster]
            The guard the wretched from the inclement sky.
                                                  --Pope.
      [1913 Webster]
            Teach us further by what means to shun
            The inclement seasons, rain, ice, hail, and snow!
                                                  --Milton.
      [1913 Webster]
WordNet (r) 3.0 (2006):
inclement
    adj 1: (of weather or climate) severe [ant: clement]
    2: used of persons or behavior; showing no clemency or mercy;
       "the harsh sentence of an inclement judge" [ant: clement]
Moby Thesaurus II by Grady Ward, 1.0:
96 Moby Thesaurus words for "inclement":
   Siberian, algid, arctic, astringent, austere, bad, below zero,
   biting, bitter, bitterly cold, bleak, blustery, boreal, bowelless,
   brisk, brumal, brutal, cold, cold as charity, cold as death,
   cold as ice, cold as marble, crisp, cruel, cutting, dog-eat-dog,
   dour, extreme, flinty, freezing, freezing cold, frigid, gelid,
   glacial, grim, hard, harsh, heartless, hibernal, hiemal,
   hyperborean, ice-cold, ice-encrusted, icelike, icy, inexorable,
   intemperate, keen, merciless, nipping, nippy, numbing, penetrating,
   piercing, pinching, pitiless, rainy, raw, relentless, remorseless,
   rigorous, rough, rugged, ruthless, severe, sharp, sleety, slushy,
   snappy, squally, stern, stone-cold, stormy, stringent, subzero,
   supercooled, tempestuous, uncompassionate, uncompassioned,
   unfeeling, unforgiving, ungentle, unmerciful, unpitiful, unpitying,
   unremorseful, unsparing, unsympathetic, unsympathizing, unyielding,
   violent, winterbound, winterlike, wintery, wintry, without mercy