gement_ is a common euphemism for _insanity_.
_Delirium_ is always temporary, and is specifically the _insanity_ of
disease, as in acute fevers. _Dementia_ is a general weakening of the
mental powers: the word is specifically applied to senile _insanity_,
dotage. _Aberration_ is eccentricity of mental action due to an abnormal
state of the perceptive faculties, and is manifested by error in
perceptions and rambling thought. _Hallucination_ is the apparent
perception of that which does not exist or is not present to the senses,
as the seeing of specters or of reptiles in delirium tremens.
_Monomania_ is mental _derangement_ as to one subject or object.
_Frenzy_ and _mania_ are forms of raving and furious _insanity_. Compare
synonyms for DELUSION; IDIOCY.

Antonyms:

clearness, good sense, lucidity, rationality, sanity.

* * * * *

INTERPOSE.

Synonyms:

arbitrate, intercept, intermeddle, meddle,
intercede, interfere, interrupt, mediate.

To _interpose_ is to place or come between other things or persons,
usually as a means of obstruction or prevention of some effect or result
that would otherwise occur, or be expected to take place. _Intercede_
and _interpose_ are used in a good sense; _intermeddle_ always in a bad
sense, and _interfere_ frequently so. To _intercede_ is to come between
persons who are at variance, and plead with the stronger in behalf of
the weaker. One may _interpose_ with authority; he _intercedes_ by
petition. To _intermeddle_ is to thrust oneself into the concerns of
others with a petty officiousness; _meddling_ commonly arises from idle
curiosity; "every fool will be _meddling_," _Prov._ xx, 3; to
_interfere_ is to intrude into others' affairs with more serious
purpose, with or without acknowledged right or propriety. _Intercept_ is
applied to an object that may be seized or stopped while in transit; as,
to _intercept_ a letter or a messenger; _interrupt_ is applied to an
action which might or should be continuous, but is broken in upon (L.
_rumpere_, to break) by some disturbing power; as, the conversation was
_interrupted_. One who _arbitrates_ or _mediates_ must do so by the
request or at least with the consent of the contending parties; the
other words of the group imply that he steps in of his own accord.

Antonyms:

avoid, keep aloof, keep out, retire, stand back,
hold aloof, keep away, let alone, stand aside,