IPA: /ˈbrɪt.əl.ər/
KK: /ˈbrɪtəlɚ/
More likely to break or shatter easily than something else.
The glass is brittler than the plastic, so it can break more easily.
Comparative: brittler
Superlative: brittlest
Brittler → The word is derived from "brittle" (from Old English "brytel", meaning easily broken) and the suffix "-er" (meaning one who or that which). The term "brittler" refers to something that is more easily broken than something else.
Think of something that is 'easily broken' ('brittle') and remember that 'brittler' means it is even more so.