Here are some ways to think about it:
* Not the right size or shape: Like a shoe that's too small for your foot.
* Not the right material: Like using a paper cup for hot soup.
* Not the right personality: Like asking a shy person to give a presentation.
* Not the right skill set: Like hiring a plumber to fix your computer.
Here are some examples of how "unsuitable" might be used:
* "The weather is unsuitable for a picnic." (The weather is too bad).
* "This book is unsuitable for young children." (It's too complex or has inappropriate content).
* "He was considered unsuitable for the job." (He didn't have the necessary skills or experience).
Synonyms for "unsuitable" include:
* inappropriate
* unfit
* inadequate
* improper
* unfitting
* unqualified
* unacceptable
* inappropriate
* undesirable