Equipped with armor heavy enough to provide protection against fire from light arms(adjective)
WordNet. Princeton University. 2010.
Use "lightly armored" in a sentence
"The heaviest losses had been suffered by the crews in the battalion's lightly armored Panzer IIIs."
"Anyone who knew Jochen Peiper knew that he would want to find out with certainty what had happened to the crew of the armored personnel carrier, but he did not want to send one of the lightly armored half-tracks back into the artillery fire."