Outmatched

Ziri's team was completely outmatched.

Ziri was completely outmatched by his opponent.

Near-synonyms: outgunned, in too deep, out of one's depth, over one's head

The company's executives mistakenly assumed that they could have a 20-person team cover the work of a 40-person team, causing the staff to be wholly outmatched and thus leading to missed quality defects.