Less than a certain amount, age, or level; under

Used after a verb to indicate that the action cannot be completed or the result cannot be reached; used in resultative verb compounds such as 看不到 kàn​bu​dào or 买不到 mǎi​bu​dào.

To not arrive at or reach a location; to not go as far as

(literary) unexpectedly; not likely; to not anticipate

To not be to the point of; unlikely to happen; will not