Appropriate
Proper, Suitable, Irresponsible
noun, な adjective
てきとう
適当 (てきとう) Appropriate, Proper, Suitable, Irresponsible
不適 (ふてき) Unsuitable, Inappropriate
穏当 (おんとう) Proper, Reasonable
快適 (かいてき) Pleasant, Agreeable, Comfortable
It's Appropriate to blame tectonic てきとう plates for earthquakes. It would be Irresponsible not to study them.