Synonyms For "Swell" :

1 syllable:

beau, dude, fop, good, great, keen, neat, old, sheik, well

2 syllables:

bully, clotheshorse, corking, cracking, dandy, gallant, groovy, nifty, not bad, peachy, puff up, smashing, tumesce, well up

3 syllables:

intumesce, tumefy