lawful unlawful___essential unessential___formal __informal_
moral _immoral__important _unimportant__honest __dishonest_
legal _illegal__acceptable _unacceptable__fair unfair___
rational _irrational__loyal disloyal___just _unjust__
necessary _unnessary__natural _unnatural__reliable _unreliable__
ethical _unethical__logical _illogical__possible _impossible__
responsible _irresponsible__safe _unsafe__perfect _imperfect__