Word: thiefproof
Part of speech: Adjective
Syllables: thief
proof
Definition: secure against thieves
Morphemes:
Affix: thief
Language: en
PoS: Noun
Meaning: One who steals another person's property, especially by stealth and without using force or violence.
Affix: -proof
Language: en
PoS: Suffix
Meaning: Used to form adjectives denoting an impervious or impenetrable quality.