are pure sinusoide vs are pure sinusoidal

Some examples from the web:

• I will, but only because I believe your intentions are pure.
• She loves all mankind and believes that their hearts are pure and true.
• If they are pure of heart and mind, yes.
• The ones who are pure evil.
• I swear my motives are pure.
• The thing is, you are pure energy now.
• But this year, my intentions are pure.
• I'm sure the last 10 yards are pure torture.
• I believe their intentions are pure.
• The classical garments are pure convention.
• How blessed are those whose hearts are pure.
• Look, you are pure and perfect.
• Our hearts are pure, Tom Builder.
• Such ambitions are pure fantasy and mere tilting at windmills.
• Its motives are pure, but it's just one force against an army of nonrenewable resources.
• I am thirsty, you are pure water
• And these tapes, Your Honor, are pure carnality.
• Okay, these areas are pure cartilage, right?
• I don't know what I'm supposed to do to convince you that my intentions are pure and honourable.
• Whatever your... Feelings were for him last summer, his actions now are pure Grayson.

Some examples from the web:

• I will, but only because I believe your intentions are pure.
• She loves all mankind and believes that their hearts are pure and true.
• If they are pure of heart and mind, yes.
• The ones who are pure evil.
• I swear my motives are pure.
• The thing is, you are pure energy now.
• But this year, my intentions are pure.
• I'm sure the last 10 yards are pure torture.
• I believe their intentions are pure.
• The classical garments are pure convention.
• How blessed are those whose hearts are pure.
• Look, you are pure and perfect.
• Our hearts are pure, Tom Builder.
• Such ambitions are pure fantasy and mere tilting at windmills.
• Its motives are pure, but it's just one force against an army of nonrenewable resources.
• I am thirsty, you are pure water
• And these tapes, Your Honor, are pure carnality.
• Okay, these areas are pure cartilage, right?
• I don't know what I'm supposed to do to convince you that my intentions are pure and honourable.
• Whatever your... Feelings were for him last summer, his actions now are pure Grayson.