a superstructure / excessive work

(transitive) To make (someone) work too hard. / (intransitive) To work too hard. / To fill too full of work; to crowd with labour. / To decorate all over.

simple past tense and past participle of overwork

Subjected to too much work. / (of a word, phrase, etc.) Having been overused such that it has lost its meaning; trite; banal.

present participle of overwork

Third-person singular simple present indicative form of overwork