considerably;  fairly;  quite
 serious;  honest;  sober;  grave;  earnest;  steady
 serious;  grave;  dignified;  solemn
 to nod;  to bow one's head in assent;  to agree
 or rather (say);  or better (say);  or perhaps I should say;  or, how should I put it;  I mean
 sudden;  abrupt;  urgent;  pressing;  steep;  sharp;  rapid
 somehow;  how;  in what way;  why;  what kind of
 to weigh on one's mind;  to bother one;  to be interested (in);  to be curious (about);  to feel like (doing);  to feel inclined to
 somehow or other;  for some reason or another;  without knowing why
 doubt;  question;  suspicion;  dubiousness
 vague;  ambiguous;  shady;  disreputable;  fuzzy
 answer;  reply;  response;  answer;  solution;  result
 to return (something);  to restore;  to turn over;  to turn upside down;  to pay back;  to retaliate;  to respond (with)
 that;  the matter in question
 shivering (with cold);  trembling (with fear);  shuddering
 to stop (an activity);  to cease;  to discontinue;  to cancel;  to abandon;  to give up
 this way;  this direction;  here;  this (one);  I;  me
 together (with);  at the same time;  in a lump
 now that you mention it;  come to think of it;  that reminds me;  on that subject;  speaking of which
 increasingly;  more and more;  decreasingly (when declining);  less and less
 to like;  to be pleased with;  to be delighted with;  to take a liking to;  to suit one's fancy
 to wrinkle up (one's eyebrows, one's nose);  to furrow;  to crimple
 anxiety;  uneasiness;  worry;  apprehension;  fear;  insecurity
 as expected;  sure enough;  after all (is said and done);  in the end;  too;  also
 very recently;  in the very recent past
 seriousness;  earnestness;  truth;  sanctity
 doubt;  suspicion;  misgivings;  scruples
 sudden;  abrupt;  unexpected;  unforeseen
 putting that aside;  that said;  apart from that;  anyway;  be that as it may
 what!;  oh;  what the heck;  what the;  damn
 marks;  points;  score;  number of items;  number of articles
 dangerous;  risky;  awful;  terrible;  terrific;  amazing
 mistake;  error;  accident;  mishap;  improper conduct (e.g. between man and woman);  indiscretion
 marking;  grading;  scoring
 being at sea;  losing one's bearings; (arch.)  disorientation upon waking at night; (arch.)  forgetting which house or room to enter
 red;  crimson;  red-containing colour (e.g. brown, pink, orange);  Red (i.e. communist);  red light (traffic);  red ink (i.e. in finance or proof-reading);  (in) the red
 to write;  to compose;  to pen;  to draw;  to paint
 (getting a) perfect score;  scoring 100;  grading students on a scale of one hundred;  doing perfectly (in a test);  leaving nothing to be desired
 dot;  spot;  mark (in an exam, etc.);  grade;  point (in a game);  score;  point (in geometry)
 acceptable;  satisfactory;  approval;  being in favour;  Pass (grade);  Fair
 wrong;  bad;  not allowed;  not possible;  failing grade
 subtle;  delicate;  difficult;  complex;  doubtful;  questionable
 supervision;  control;  superintendence;  director;  superintendent;  supervisor
 to do without being seen (by);  to do behind (someone's) back;  to do without the knowledge of (e.g. one's parents)
 unfair practices;  wrongdoing;  malpractice;  cheating;  foul play
 to work;  to labor;  to function;  to operate;  to commit (e.g. a crime);  to perpetrate