That seems like the loose understanding between the two. Were the 1944 USAAF bombings of Krupp Stahl works terrorism? They would be according to your understanding.

For example, missiles from unmanned drones hitting civilian targets like schools and hospitals.

Note the statistics here [0] - of course the numbers are very fuzzy but at the worst case scenario it's 1:2.5 civilians: military targets. So for every 2.5 military targets, 1 civilian. That fits the bill for extreme and indiscriminate.

[0] https://en.m.wikipedia.org/wiki/Drone_strikes_in_Pakistan

Hitting is not the same as targeting, so no.

Also, one needs to indicate the difference between e.g. a hospital building acting as nothing but a hospital, and one that has been evacuated of patients and used as a militant staging post.