The phrase "with regard to" is used to reference something specific.
So "With regard to his principles, he has to be very careful" is the correct form.
اپنے اصولوں کے حوالے سے اسے بہت محتاط رہنا پڑتا ہے۔
Abate means کم
Lessen means کم
DEXTEROUS means ہنر مند
Inexpert means ناتجربہ کار
Imp means چھوٹا شیطان
Angel means فرشتہ
Insolvent means دیوالیہ
Concession means مراعات
Allowance means مراعات
Terrible means خوفناک
Soothing means سکون بخش