to sigh;  to breathe a sigh
 skill;  dexterity;  proficiency
 to gain experience;  to accumulate experiences
 question;  inquiry;  enquiry
 conclusive evidence;  positive proof;  definite proof;  confirmation
 unique;  individual;  original;  unusual
 distinction;  difference;  separate;  different;  exception;  exclusion
 intelligence;  intellect;  brains
 may;  might;  perhaps;  may be;  possibly
 valid;  proper;  right;  appropriate;  reasonable
 special;  particular;  peculiar;  unique
 to make progress;  to develop;  to evolve (method, style, etc.)
 to lead;  to spearhead (a group);  to command (troops)
 usual;  ordinary;  normal;  regular;  general;  common
 unique;  peculiar;  singular
 since some time ago;  for quite a while;  already
 intuition;  instinct;  insight;  hunch;  immediacy
 matter;  affair;  counter for (received) emails, text messages, voicemail messages, etc.;  counter for accounts (on a website, email service, etc.)
 conviction;  belief;  confidence
 change;  variation;  variety;  diversity;  inflection;  declension
 to make a mistake;  to be incorrect;  to be mistaken
 preface;  introduction;  preamble
 fairy tale;  fairy story;  nursery tale
 dramatization (e.g. of a novel);  dramatisation;  adaptation;  dramatization;  embellishment;  exaggeration
 fiction;  made-up story;  fable;  fabrication;  myth
 that's the way it is;  such is life
 ordinary person;  member of the general public;  non-celebrity
 old;  aged;  long;  since long ago;  of the distant past;  long-ago
 the past;  bygone days;  one's past (that one would prefer remained secret);  past (tense);  preterit;  previous life
 capture (of enemy territory);  taking (by storm);  defeating (an opponent);  attacking (a problem) strategically
 dramatic (improvement);  remarkable (difference);  marked;  (far) better;  exceptional
 last (i.e. immediately preceding);  previous;  pre- (e.g. premodern);  before;  before;  earlier
 to feel gloomy;  to have doubts (e.g. about the future);  to be at a loss (e.g. over what to do)
 dark;  gloomy;  depressed;  dispirited;  dark (in colour);  dull;  ill-boding
 really;  truly;  indeed;  good grief
 hypothesis;  supposition;  assumption;  tentative theory
 unthinkable;  unexpected;  absolutely not!;  far from it!;  (it was) no bother at all;  not at all
 to get the short end of the stick;  to get the bad end of a bargain
 now that you mention it;  come to think of it;  that reminds me;  on that subject;  speaking of which
 degree of difficulty;  difficulty level
 fall;  decline;  lowering;  deterioration;  degradation