suffix, na-adjective
does not seem; unlikely; improbable
Attaches to the stem of adjectives and verbs to express a negative conjecture: 'it doesn't look like...', 'it seems not...'. Equivalent to 〜そうにない.
明日は雨が降らなさそうだ。
It doesn't look like it will rain tomorrow.
この問題は簡単ではなさそうだ
This problem doesn't seem easy.
彼は来られなさそうな顔をしていた。
He had a face that said he probably couldn't come.