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The suffix for "uninterested" is "-ed."
She seemed uninterested in the topic of conversation and kept glancing at her phone.
No, the word uninterested is an adjective, a word to describe a noun as lacking interest.
The noun form for the adjective uninterested is uninterestedness.
She seemed uninterested in the topic of conversation and quickly changed the subject.
The prefix for the word "uninterested" is "un-".