12
uncrossed
8
forwardly
6
beforehand
5
formerly
4
below
3
lengthwise(adverb, longitudinally)
3
open
3
forrad
3
forrader
3
forrard
3
forwards
3
from top to bottom(expression, idiom, adverb, lengthwise)
3
frontward
3
lengthways
2
forth
2
beyond
2
fore
2
frontwards
2
endlong(adverb, lengthwise)
1
along
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10 years ago|1.7k views|share |citing 
APASmart Define. (2015). across thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/across/thesaurus/antonyms
ChicagoSmart Define. 2015. "across thesaurus" https://smartdefine.org/across/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2015, across thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/across/thesaurus/antonyms>.
MLASmart Define. "across thesaurus" 15 November 2015. Web. 22 September 2026. <https://smartdefine.org/across/thesaurus/antonyms>