Meaning of the word borderline in English

What does borderline mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

borderline

US /ˈbɔːr.dɚ.laɪn/
UK /ˈbɔː.də.laɪn/

Adjective

on the edge between two categories or states; ambiguous or indeterminate

Example:
His behavior was borderline rude.
The patient's condition is borderline, requiring close monitoring.

Noun

a boundary or dividing line

Example:
The river forms a natural borderline between the two countries.
There's a fine borderline between genius and madness.