Antonyms of adj lightheaded

2 senses of lightheaded

Sense 1
faint, light, swooning, light-headed, lightheaded -- (weak and likely to lose consciousness; "suddenly felt faint from the pain"; "was sick and faint from hunger"; "felt light in the head"; "a swooning fit"; "light-headed with wine"; "light-headed from lack of sleep")

INDIRECT (VIA ill) -> well -- (in good health especially after having suffered illness or injury; "appears to be entirely well"; "the wound is nearly well"; "a well man"; "I think I'm well; at least I feel well")

Sense 2
airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly -- (lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles")

INDIRECT (VIA frivolous) -> serious -- (concerned with work or important matters rather than play or trivialities; "a serious student of history"; "a serious attempt to learn to ski"; "gave me a serious look"; "a serious young man"; "are you serious or joking?"; "Don't be so serious!")

Similarity of adj lightheaded

2 senses of lightheaded

Sense 1
faint, light, swooning, light-headed, lightheaded -- (weak and likely to lose consciousness; "suddenly felt faint from the pain"; "was sick and faint from hunger"; "felt light in the head"; "a swooning fit"; "light-headed with wine"; "light-headed from lack of sleep")
       => ill (vs. well), sick -- (affected by an impairment of normal physical or mental function; "ill from the monotony of his suffering")

Sense 2
airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly -- (lacking seriousness; given to frivolity; "a dizzy blonde"; "light-headed teenagers"; "silly giggles")
       => frivolous (vs. serious) -- (not serious in content or attitude or behavior; "a frivolous novel"; "a frivolous remark"; "a frivolous young woman")