The term "acerous" is often used to describe a plant or tree with needle-like leaves. When we talk about something being "more acerous", we're essentially searching for words that convey a greater degree of needle-like properties. Some possible synonyms for "more acerous" might include "spiny", "bristly", "prickly", "thorny", "barbed", or "pointed". We might also use descriptors like "spikey", "sharp", or "jagged" to help convey the same idea. Depending on the context of the sentence, there may be other words that fit the bill for "more acerous" as well.