not ... at all

even if ...,...cannot

important, weighty / valuable

importance, weight / value

very, exceedingly, awfully / (before a negative form) not at all, at all, by no means

character, a fictitious person or creature / personality

key (tool for opening or locking something) / key; clue (important fact for solving something) / lock

(computing) key / (music) key

key

(chiefly women's speech) first person singular pronoun: I, me