The difference between Naff and Sick

When used as adjectives, naff means in poor taste, whereas sick means having an urge to vomit.

Sick is also noun with the meaning: sick people in general as a group.

Sick is also verb with the meaning: to vomit.

check bellow for the other definitions of Naff and Sick

Naff as an adjective (British, _, slang):

In poor taste.

Examples:

"That tie is a bit naff, don’t you think?"
Naff as an adjective (Polari):

Bad; tasteless.
Naff as an adjective (British, _, slang):

Poorly thought out, not workable, or otherwise not very good.

Examples:

"That’s a really naff example."
Naff as an adjective (Polari):

Heterosexual.

Sick as an adjective:

Having an urge to vomit.
Sick as an adjective (chiefly, American):

In poor health.

Examples:

"She was sick all day with the flu."
Sick as an adjective (colloquial):

Mentally unstable, disturbed.
Sick as an adjective (colloquial):

In bad taste.

Examples:

"That's a sick joke."
Sick as an adjective:

Tired of or annoyed by something.

Examples:

"I've heard that song on the radio so many times that I'm starting to get sick of it."
Sick as an adjective (slang):

Very good, excellent, awesome, badass.

Examples:

"This tune is sick."

"Dude, this car's got a sick subwoofer!"
Sick as an adjective:

In poor condition.

Examples:

"'sick building syndrome; my car is looking pretty sick; my job prospects are pretty sick'"
Sick as an adjective (agriculture):

Failing to sustain adequate harvests of crop, usually specified.

Sick as a noun:

Sick people in general as a group.

Examples:

"We have to cure the sick."
Sick as a noun (British, colloquial):

vomit.

Examples:

"He lay there in a pool of his own sick."

Sick as a verb:

To vomit.

Examples:

"I woke up at 4 am and sicked on the floor."
Sick as a verb (obsolete, intransitive):

To fall sick; to sicken.