Not clement; destitute of a mild and kind temper; void of tenderness; unmerciful; severe; harsh.
Physically severe or harsh (generally restricted to the elements or weather); rough; boisterous; stormy; rigorously cold, etc.; as, inclement weather.
Unmerciful, Merciless, Unsparing
Inclement in Spanish is Inclemente
Inclement in Tagalog is Walang-awa