Is cowardly an adjective?

[Mariuszkusz]

English Grammar Tests, Elementary Level

ESL/EFL Test #241 "Opposite Meanings (3)", question 8

Roy is not .......... He is cowardly. He is afraid of everything!

(a) kind
(b) bitter
(c) tall
(d) brave

English Grammar Tests, Elementary Level

ESL/EFL Test #241 "Opposite Meanings (3)", answer 8

Roy is not brave. He is cowardly. He is afraid of everything!

Correct answer: (d) brave

Your answer was: correct
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Hi there,
Is not a word "cowardly" an adverb? So, should it not be: "He is coward". Or, in this situation: "He behaves cowardly".
Thanks

[Torsten]

Cowardly is an adjective.
Coward is a noun.

He is a cowardly coward.

TOEIC listening, photographs: A presentation

[Linda]

'Brave' is an adjective and the test is called 'Opposite Meanings', so 'cowardly' is the right choice because it's also an adjective.
A coward, as Torsten stated, is a noun and is not the right choice here.
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[Mordant]

"Cowardly" is also an adverb, but its more common use is as an adjective.