fateful — having momentous significance or consequences; decisively important; portentous: a fateful meeting between the leaders of the two countries.
memorable — worth remembering; notable: a memorable speech.
remarkable — notably or conspicuously unusual; extraordinary: a remarkable change.
active — Someone who is active moves around a lot or does a lot of things.
consequential — Consequential means the same as consequent.
critical — If a person is critical or in a critical condition in hospital, they are seriously ill.
crucial — If you describe something as crucial, you mean it is extremely important.
decisive — If a fact, action, or event is decisive, it makes it certain that there will be a particular result.
full — completely filled; containing all that can be held; filled to utmost capacity: a full cup.
historic — well-known or important in history: a historic building; historic occasions.
notable — worthy of note or notice; noteworthy: a notable success; a notable theory.
noteworthy — worthy of notice or attention; notable; remarkable: a noteworthy addition to our collection of rare books.
outstanding — prominent; conspicuous; striking: an outstanding example of courage.
signal — anything that serves to indicate, warn, direct, command, or the like, as a light, a gesture, an act, etc.: a traffic signal; a signal to leave.
