posthaste [pəʊstheɪst]
(adv.)
with all possible speed; as quickly as possible;
with great haste; as fast as possible.
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haste [heɪst]
(noun)
a situation in which you are in a hurry and do something more quickly than you should – read more here
speed in doing something, especially because you do not have enough time – read more here
unnecessarily quick action; thoughtless speed.
to make haste= to hurry
tantamount [tæntəmaʊnt]
(adj.)
equivalent in value, significance, or effect.
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metaphraze 