Among the given options, arginine, histidine, and lysine are all basic amino acids because they contain amino (-NH₂) and imino (-NH=) functional groups that can accept a proton (H⁺) to become positively charged.

Asparagine, on the other hand, contains an amide (-CONH₂) functional group instead of an imino group. This functional group is not basic because it does not have a proton that can be easily removed. Therefore, the answer is: asparagine.