1(as a resultative verb suffix) unable to (do sth)
2(pattern: {verb} + 个|个 + ~) without end; incessantly
Examples
wǒ我tài太lèi累le了，zuò做bù liǎo不了gōng kè功课。
我太累了，做不了功课。
I'm too sleepy to do my homework.
车发动不了因为电池没电了。
The car won't start because the battery has run down.
他的眼睛掩饰不了内心的恐慌。
His eyes betrayed his fear.