This adjective can also mean "keen" when used to describe some senses or sense organs, but the keenness would usually not be in a favorable way. For example:
Matalas ang mata niyang si Lisa, kaya mag-ingat ka sa mga pagkilos mo. = Lisa is very observant, so be careful with how you behave.
Ang tainga niyang si Robert ay matalas kaya hinaan lang natin ang usapan natin at baka marinig niya tayo. = Robert has a keen sense of hearing so let's talk quietly as he might hear us. (The speaker may literally mean that Robert's ears are quite sensitive or may also mean that Robert is an eavesdropper.)
Ang talas ng pangamoy mo, Jim. Hindi kami makakain ng pasikreto sa iyo. = You have a very keen sense of smell, Jim. We can't eat secretly away from you. (Said in jest because Jim arrived unexpectedly while they were eating.)