unforgiving
adj. B2 Upper Intermediate US //ənfɝˈɡɪvɪŋ// UK //ʌnfəɡˈɪvɪŋ// un·for·giv·ing
adj. very difficult to deal with or very strict. You use this to describe a situation or a person that does not give you any mercy.
adj. demanding, severe, or difficult to endure. Often used to describe environments, people, or systems that offer no leniency or second chances.
The mountain trail is unforgiving in the winter.
The new boss is known for being unforgiving of any mistakes, so everyone works very carefully.
The desert is an unforgiving landscape where a single miscalculation regarding water supply can lead to a fatal outcome for the entire expedition.