不堪設想

Function word; no; not; un-; negative prefix; used to form questions or emphasize a statement; sometimes used for rhythm.

can; to be able to; to endure; to bear; worthy of; capable of a certain quality

to set up; to establish; to arrange; to display; to suppose; if; to plan; to design

To think or consider; to want or desire to do something; to guess or suppose; to miss someone; to believe or feel that something is true.