difficult; tough; formidable; redoubtable; stubborn
(an) unknown; unknown number; variable; unknown quantity; not yet known
source of information; intelligence source; message source
inattention; distraction; mind-wandering
elucidation; explicit statement; specification
pinch (of something); one piece; easy victory
to mix (e.g. water with flour); to dissolve (salt in water, paint, etc.); to scramble (eggs); to stir; to melt; to liquefy
thereupon; shortly thereafter
grey-brown; gray-brown; dun
something new (of poor quality)
to work out a plan of deception; to scheme; (arch.) to think up a plan; (arch.) to think over a plan; (arch.) to discuss; (arch.) to consult
to rain (drops on the large side); to go to pieces; to be taken apart
(a) principle; (a) reason; (a) point; some truth
to throb (with pain); to ache; to smart; to rankle; to gall; to rile
water-resistant; waterproof
superscription (on a letter, parcel, etc.); address; overwriting (data, file, etc.)
product bundling; tie-in-sale; package deal
unevenness (e.g. in quality); inconstancy; variation; dispersion; scatter; spread
unpleasant; revolting; feeling sick; feeling unwell; uncomfortable; annoying
burly; strong; indomitable; indefatigable; robust (vitality, appetite, economic growth, etc.); strong
sorrow; grief; anguish; anxiety; worry; trouble
to walk; to go on foot; to tread (a figurative path); to follow; to advance towards (e.g. a solution); to set out (e.g. on the path to destruction, ruin, etc.)
a little late; somewhat late; latish; a little slow; somewhat slow
(on a) closer look; closer scrutiny; second look
nest; rookery; den; haunt; (spider's) web
short and stout; small but wide around
unusual event; strange occurrence; strange phenomenon; something abnormal; change (for the worse); accident
superlative; extraordinary; mega; superdreadnought (class of warships)
lock; lock (in rugby); lock forward
(tear) to pieces; (rip) apart; with a rattle; with a shudder; feeling an electric shock
atmosphere; air; magnanimous; generous; large-hearted
distinction; discrimination
aim; object; expectations; prospects; something that can be relied upon; snack served with alcoholic drink; pad
raging bull; ferocious bull
group; flock; crowd; wide expanse (of flowers)