The term 'not lenient' can be described by four words, all of which have five or more letters. The first word is 'HARSH, ' which means unkind or severe. The second word is 'STERN, ' which means serious and unyielding. The third word is 'STRICT, ' which means demanding and exacting. Finally, the fourth word is 'STRINGENT, ' which means rigidly enforced. All of these words describe a situation that is not lenient, meaning that it is not relaxed or permissive.