"niftier" in the adjective sense
1. bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad, peachy, slap-up, swell, smashing, old
"he did a bully job"
"a neat sports car"
"had a great time at the party"
"you look simply smashing"
"we had a grand old time"
Source: WordNet® (An amazing lexical database of English)
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