noun which may take the genitive case particle 'no'
unavailable; unable to respond; cannot handle
Used for people, services, or systems that cannot deal with a request, demand, or situation. Often seen in customer service contexts.
We are unable to take phone calls today.
I cannot handle this problem alone.
noun which may take the genitive case particle 'no'
incompatible; unsupported
Technical use for devices, software, or formats that do not work together or are not supported.
This printer is incompatible with the latest OS.
対応 means 'correspondence' or 'handling'; 対応不可 is the negative form meaning 'cannot handle' or 'incompatible'.
不可 is a suffix meaning 'not possible' or 'not allowed'; it attaches to nouns to form no-adjectives like 対応不可.
Compound of 対応 (handling, correspondence) and 不可 (not possible). A straightforward Sino-Japanese formation.