Word: drillproof
Part of speech: Adjective
Syllables: drill
proof
Definition: Resistant to drills.
Morphemes:
Affix: drill
Language: en
PoS: Verb
Meaning: To cause to drill (practice); to train in military arts.
Affix: -proof
Language: en
PoS: Suffix
Meaning: Used to form adjectives denoting an impervious or impenetrable quality.