very interesting; of great interest
simply; merely; only; solely
secret; secrecy; mystery; secret (e.g. to success); esoteric teachings
feather; plume; wing; shuttlecock (in badminton)
fence; hedge; railing; barrier; wall
majority; more than half; most (of); mostly; largely; mainly
contribution (furthering a goal or cause); services (to a cause); paying tribute; tribute
unfathomable; inestimable; immeasurable
lately; recently; these days
to decrease (in size or number); to diminish; to abate
to mind (negative nuance); to care about; to worry; to pay undue (amount of) attention to (something)
to feel; to sense; to be moved (by); to be touched (by); to become infected with (an illness); to catch
bicuspid valve; mitral valve
illness; condition; -pathy
it is, isn't it?; I know, right?; innit?
record; document; minutes; record (e.g. in sports); setting (a record); recording (a record high, etc.)
renewal; update; replacement; renovation; breaking (a record)
to take back; to get back; to regain; to recover; to restore; to recoup
to rage; to storm (at); to be furious; to enthuse; to speak enthusiastically; to speak with vigour
where ... is concerned; when it becomes; if it becomes
worst; horrible; horrid; in the worst case; if worst comes to worst
thesis; essay; treatise; paper; article
to write; to compose; to pen; to draw; to paint
before very long; soon; someday; of the previously mentioned; of that number; among them
under investigation; under consideration; under review; pending (decision, etc.); awaiting verification
error; mistake; fault; sin; wrongdoing; offense
plain; simple; reserved (behaviour, attitude, etc.); modest; quite; a (little) bit
total hours spent working
grateful; thankful; welcome; appreciated; evoking gratitude
servant; manservant; menial
equality (esp. of status); equal footing; equal terms
idealistic theory; unrealistic argument
general; popular; common; typical
mechanism; machinery; system; structure; organization
center; centre; middle; -centered; -centred; -focused
circumference; perimeter; work outside the office; outer tracks (in a loop or curve)
best members (selected for a team); (lineup of) top players; A-team
woman; female; female lover; girlfriend; mistress
skilled; skillful; skilful; competent; capable; good