challenging · tough · solidifying · hardening · arousal · struggle · straining · tense · unyielding · concrete · frozen · callous · steely · bracing · thickening · setting · curing · crystallizing
IDEA.org / Words / getting hard
Related — stiff (Not easily bent); rigid (Unable to bend); erect (Vertical in position); firm · difficult · challenging · tough · solidifying · hardening · arousal · struggle · straining · tense
physical rigidity/softnessgetting hard ≠ softening Becoming less firm; loosening · relaxing · melting · yielding · liquefying
difficulty levelgetting hard ≠ simplifying Making less complex; lightening up · easing up
sexual arousal (male)getting hard ≠ deflating Releasing contained gas; wilting · losing it
Word data: Linguabase (CC0) · www.idea.org/words/getting_hard