The noun form for the adjective careful is carefulness.
The suffix of the word careful is "ful".
Care
care ful
'ing' - caring 'less' - careless 'ful' - careful
The suffix "-ful" typically changes a noun into an adjective meaning "full of" or "having a lot of." For example, "careful" means full of care. On the other hand, the suffix "-less" typically negates the meaning of the word. For example, "careless" means without care.
No, -ful can be added to a noun to form another noun or an adjective. Examples: spoon (noun) spoonful (noun) hope (noun) hopeful (adjective) Usually, the suffix -ly is added to an adjective to create an adverb. Examples: usual (adjective) usually (adverb) hopeful (adjective) hopefully (adverb)
-ful. You'd end up with "peaceful" which is an adjective. Peace without a suffix is a noun.
care-ful-ly
The plural form for the noun teaspoonful is teaspoonfuls.
3.care-ful-ly.
careful full of care
There are three syllables. Care-ful-ly.