The Oxford Thesaurus An A-Z Dictionary of Synonyms INTRO ...

informative, instructive, enlightening, edifying, eye-opening,
revelatory, educative: A year spent abroad is always
educational.
5.5 eerie
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eerie adj. frightening, weird, strange, uncanny, ghostly, spectral,
dreadful, unearthly, frightful Poetic or Scots eldritch, Scots
mysterious, Colloq scary, creepy, spooky: I had the eeriest
feeling I was being watched.
5.6 effect...
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effect n. 1 result, consequence, outcome, conclusion, upshot,
aftermath, impact: The effects of the storm could be seen
everywhere. 2 effectiveness, efficacy, force, power, capacity,
potency, influence, impression, impact, Colloq clout, punch:
His threats had no effect. 3 significance, meaning,
signification, purport, sense, essence, drift, implication,
import, tenor, purpose, intent, intention, object, objective:
She said 'Get lost', or words to that effect. 4 impact,
impression, form, sensation: He didn't mean that, he just said
it for effect. 5 in effect. effectively, virtually, for (all)
practical purposes, so to speak, more or less; actually, in
(point of) fact, really, essentially, basically, at bottom, in
truth, truly, to all intents and purposes, at the end of the
day, any way you look at it: She always spoke of him as her
adopted son and this, in effect, was what he was. 6 take effect.
become operative or operational, come into force, begin or start
to work or function or operate: The regulation doesn't take
effect till next week.
--v. 7 bring about, cause, make happen or take place,
effectuate, achieve, accomplish, secure, obtain, make, execute,
carry out, produce, create: The opposition was unable to effect
any change in the law.
effective adj. 1 effectual, efficacious, productive; capable, useful,
serviceable, competent, operative, able, functional, efficient: