Stalemated.

Of persons: (Looking) as if deprived of the faculty of speech or action; ‘shut up,’ utterly disconcerted, discomfited, resourceless, or non-plussed…

That has been attempted or undertaken; designating a task or purpose which has been embarked upon.

= nonplussed, adj. Obsolete.

Plunged or entangled in a bog; bemired. Also figurative.

Brought to a nonplus or standstill; at a nonplus; perplexed, confounded.

Nonplussed. Obsolete.

brought to a deadlock.

Also figurative.

ruined, stymied.

= gridlocked, adj.