substandard

As adjectives the difference between dreadful and substandard

is that dreadful is causing dread; very bad while substandard is of inferior quality; not meeting the minimum quality requirements.

As a noun dreadful

is a shocking or sensational crime.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective substandard is

of inferior quality; not meeting the minimum quality requirements.

As an adjective substandard

is of inferior quality; not meeting the minimum quality requirements.

As a noun substandardness is

the state or condition of being substandard.

As an adjective substandard

is of inferior quality; not meeting the minimum quality requirements.

As an adverb substandardly is

in a substandard way.