=
KEY: Perilous.
SYN: Hazardous, dangerous.
ANT: Safe, secure, certain.
=
KEY: Period.
SYN: Time, date, epoch, era, age, duration, continuance, limit, bound, end, conclusion, determination.
ANT: Eternity, datelessness, immemoriality, infinity, perpetuity, illimitability, endlessness, indefiniteness, indeterminateness.
=
KEY: Periodical.