Strengthened, past participle of strengthen. Synonyms in the same form.
Fortify
fortified, invigorated, encouraged, supported, sustained, hardened, nerved, confirmed, braced, steeled, corroborated, stayed, comforted, shored, animated, roborated
Tone up
toned
Intensify
intensified, augmented, heightened, advanced
Other
consolidated, built, re-enforced, annealed
All synonyms for strengthen →