This is the 11248th most frequent Portuguese word.
menosprezar
To undervalue or disdain.
The usage of 'menosprezar' here indicates undervaluing someone's effort.
Ele tende a menosprezar o esforço dos outros.
He tends to underestimate the effort of others.
In this case, 'menosprezar' is used to caution against disregarding the significance of a topic.
Jamais deveríamos menosprezar a importância da educação.
We should never underestimate the importance of education.
Here, 'menosprezar' conveys the act of demeaning or showing disregard for someone's opinions.