8
evenly(adverb, flatly)
5
flatly(adverb, flatly)
5
levelly(adverb, flatly)
4
flat(adverb, position, level, flatly)
3
crosswise(adjective, adverb, obstructive, oblique, akimbo)
2
laterally
2
level(adverb, flatly)
2
planely
1
aslant(adjective, cross, upright, over, vertical)
1
at right angles(expression, adjective, idiom, cross, over)
1
contrariwise(adjective, cross, upright, over, vertical)
1
crossways(adjective, adverb, cross, over, obstructive)
1
flush
1
from side to side(expression, adjective, idiom, cross, over)
1
horizontal
1
lengthwise
1
longways(adjective, cross, upright, over, vertical)
1
mullioned(adjective, obstructive, oblique, akimbo, sloping)
1
on the bias(expression, adjective, idiom, cross, over)
1
recumbently
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APASmart Define. (2015). horizontally thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/horizontally/thesaurus/synonyms
ChicagoSmart Define. 2015. "horizontally thesaurus" https://smartdefine.org/horizontally/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, horizontally thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/horizontally/thesaurus/synonyms>.
MLASmart Define. "horizontally thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/horizontally/thesaurus/synonyms>