boundless (e.g. universe, ocean); limitless

ultimate; final; last; eventual

to exhaust completely; to have nothing left (e.g. to say)

end; limit

dilemma; predicament

tight (e.g. finances)

distress; wretched condition

investigation (e.g. academically, of the unknown); close inquiry (enquiry)

extremely

having great difficulty with; struggling greatly with; being in distress

poverty; destitution; privation; indigence; penury

extremity; desperation