Rigidify is a word that means to make something stiff or inflexible. However, it is always good to expand your vocabulary. Here are some synonyms for the word:
1. Stiffen
2. Harden
3. Petrif y
4. Solidify
5. Strengthen
6. Fortify
7. ossify
8. Fix
9. Cement
10. Freeze
These synonyms can be used interchangeably depending on the context and tone of the sentence. Expanding your vocabulary with synonyms can make your communication much more effective and diverse.