Substandard and Weak

Substandard adjective - Falling short of a standard.

Weak and substandard are semantically related In some cases you can use "Weak" instead an adjective "Substandard".

Weak adjective - Lacking bodily strength.

Substandard and weak are semantically related in defective topic. Sometimes you can use "Substandard" instead an adjective "Weak", if it concerns topics such as deficient.

Nearby Words: weaken, weakness, weakly, weakening, weakling