noun

loneliness

loneliness, solitude, isolation

Loneliness can be a serious problem for older people.

Loneliness can be a serious problem for older people.

He felt a deep sense of loneliness.

He felt a deep sense of loneliness.

a feeling/sense of ((loneliness)) used to describe the state of being lonely He experienced a deep sense of loneliness.

Synonyms: solitude, isolation; Antonyms: companionship, togetherness

From the adjective 'lonely' plus the suffix '-ness', which forms nouns indicating a state or condition.

The '-ness' on the end turns the feeling (lonely) into a state or concept (loneliness).

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