Definitions

1. adjective

Lacking in robustness; lacking in vigor, vitality, or strength

“The patient’s robustious decline left the doctors stunned.”

2. adjective

Characterized by or exhibiting robustness; full of vigor, vitality, or strength

“The robustious personality of the leader inspired the team to work harder.”

3. noun

A quality of being robustious; the state of being robustious

“The robustiousness of the new medicine was a welcome surprise.”