generalize

• (also -ise BrE)  verb [I]

1    to make a statement about something without mentioning any details:
?It's impossible to generalize about such a complicated subject.
?It would be a mistake to generalize from only a few examples.
2    to form an opinion based on only very little information:
?It's stupid to generalize and say that all young people are rude.
?It's not fair to generalize from a few cases that all politicians are dishonest.