Last Updated：2025/11/19
(dated) Firmly or securely fixed in place; stable. / Firm against attack; fortified by nature or art; impregnable; strong.
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fast
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Source Word
fast
IPA(Pronunciation)
Adjective
dated
of people
of a neutron
of a piece of hardware
of dyes or colours
obsolete
of photographic film
Japanese Meaning
しっかりと固定され、安定している状態 / 攻撃に対して堅固な、防御が強い状態（自然または人工的な要塞のような守られ方をする）
Sense（3）
Sense（5）
(nuclear
physics,
of
a
neutron)
Having
a
kinetic
energy
between
1
million
and
20
million
electron
volts;
often
used
to
describe
the
energy
state
of
free
neutrons
at
the
moment
of
their
release
by
a
nuclear
fission
or
nuclear
fusion
reaction
(i.e.,
before
the
neutrons
have
been
slowed
down
by
anything).
Sense（10）
Sense（11）
（ comparative ）
（ superlative ）
