weapon; arms; ordnance; weapon (something used to gain an advantage); asset
difficult situation; adverse circumstances; predicament; trouble; dilemma; distress
grave; sad; mournful; sorrowful; pensive
unbearable; intolerable; unendurable
to get tired of; to lose interest in; to be fed up with; to have enough
freely; at liberty; at will; as one likes
(your) words; what you say; what you have said; a few words (of welcome, advice, etc.)
measurement error; calculation error
to be of benefit; to be useful; to be good for you
in the end; at the end of the day
to investigate thoroughly; to examine closely; to probe into; to be obsessed with a thought; to brood over; to worry about
process; procedure; sequence; protocol; instruction
to add (numbers); to add (something); to top up (with something); to take care of (e.g. one's business)
change; alteration; difference; distinction; something wrong; abnormality
leaping; activity; leapfrog (over a problem); making a leap (e.g. in logic); making great strides; making rapid progress
structure; construction; arrangement; plan; plot; contrivance
grave; solemn; stern; authoritative; hard (e.g. fact)
as a matter of fact; to tell the truth
starting point; origin; origin (of coordinate axes); datum point
look; appearance; spectacle; sight; observation meditation; outlook on ...
contradiction; inconsistency
unique; peculiar; singular
connotation; comprehension; intension; inclusion; containment within
law-like nature; regularity
establishment; settlement
versatility; multiplicity of use
flexibility; pliability; softness; elasticity
overspec; over-engineered; overqualified (job candidate)
to confuse (someone); to befuddle; to bewilder; to mystify; to throw up a smokescreen; (lit.) to surround with smoke
expedient; means; instrument; upaya (skillful means, methods of teaching)
speaking without thinking; words spoken without much thought
to be at a loss; to be puzzled
(practical) application; putting to practical use; applied
context (of a passage); line of thought; context; environment; circumstances
to do over; to remake; to resume
to be somewhat different (from before, from others, etc.)
to add (one thing to another); to add (a few more words, an explanation, etc.)
deplorable; regrettable; disappointing; vexing; unfortunate