am not

не; нет (разговорная песенно-поэтическая форма • "I ain't gonna cry no more". == "Я не буду больше плакать", - поёт девочка в рекламном ролике нового шампуня.)

be not

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worthwhile
gen.	нелишне; сто́ящий; дающий результат; выгодный; пользительный; содержательный
adv.	оправданный
inf.	ценный; путёвый
math.	целесообразен