noun which may take the genitive case particle 'no'
unrecognizable; unrecognized
Describes something that cannot be recognized or identified, often used in technical or formal contexts.
その画像は劣化が激しく、認識不能だった。
The image was so degraded that it was unrecognizable.
彼の筆跡は認識不能なほど崩れている。
His handwriting is so messy that it is unrecognizable.
Compound of 認識 (recognition) and 不能 (impossible). The exact historical derivation is uncertain, but the meaning is transparent from its components.