Synonyms|89Antonyms|5|Broader|2Narrower|8Related|52
10
rectilineal(adjective, straightness)
7
even(straight, straightness)
6
horizontal
6
linear
5
level
5
straight(adjective, curved, aligned, straightness)
5
vertical
4
direct(adjective, straightness)
4
erect
3
lineal
3
perpendicular
2
in a line(expression, idiom, straightness)
2
libratory
2
oscillatory
2
right
2
smooth
2
square(adjective, smooth, right, solid, true)
2
straightforward
2
true
2
unbent
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APASmart Define. (2015). rectilinear thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/rectilinear/thesaurus/synonyms
ChicagoSmart Define. 2015. "rectilinear thesaurus" https://smartdefine.org/rectilinear/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, rectilinear thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/rectilinear/thesaurus/synonyms>.
MLASmart Define. "rectilinear thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/rectilinear/thesaurus/synonyms>