unsafe; insecure; careless; dangerous; incautious; imprudent
front-facing; forward-looking; positive; constructive
tranquil; calm; quiet; mild (weather); balmy
fence; paling; railing; (arch.) fortress
to enclose; to corral; to fence in; to pen in
foreign; abroad; overseas
cemented carbide; superhard; ultrahard
inside and outside; interior and exterior; inside and outside the country; home and abroad; around; about
vocabulary; lexicon; lexis; terminology
most (numerous); largest (number of)
beginning; start; first (in line, etc.); origin; such as ...; not to mention ...
to evaluate; to appraise; to comment on
achievement; deed; exploit; merits
to hear; to catch (the sound of something); to hear about (rumour, etc.); to overhear; to get used to hearing
to crunch; to masticate; to simplify; to explain plainly
(approximate) time; around; suitable time (or condition); time of year; season
to grow restive; to begin to act violently
by a hair's breadth; in the nick of time; touch and go; close call; critical moment
free time; spare time; idle moment
important matter; requirement; requisite; necessary condition
to turn (one's face) away; to avert (one's eyes)
ecology; life and habits (of an animal); mode of life; way of living
research; study; investigation
encouragement; promotion; inducement; incitement; stimulation
sphere; circle; range; category
set; suit; uniform collection; entirely; all; every one
every one (of them); (one and) all; without exception; to a man; to the last person
to gain experience; to get accustomed (with something)
to follow (a rule, precedent, etc.); to conform to (the law, standards, etc.); to be proportionate to; to correspond to; to be equivalent to
success or failure; outcome; result
overanxiety; needless worry
since the beginning; natural-born (salesman, etc.); absolutely (not); (not) at all
acrobatics; acrobatic performance; stunt
discovery (of a plot, misdeed, etc.); detection; exposure; disclosure
second; number two; runner-up