Significant

significant change  大きな変化･重大な変更

significant change in my life
significant event in my life

significant  ｼｨｸﾞ 二ﾌｨｶﾝﾄ　adj)大きな意味を持つ

steep

adjective 発音『米スティープ』「英スティプ」　steep-steeper-steepest
①<of a slope, hill> rising or falling quickly, not gradually

a steep hill/slope/bank堤防

a steep climb/descent/ascent/drop

a steep flight of stairs急な階段  flight飛行、ひと続きの(階段)
The path grew steeper as we climbed higher. 高くなると道は急になった.
path小道・コース　grow～になる

②<of a rise or fall in an amount> sudden and very big

a steep decline in the barth rate   decline丁寧に断る、下落する

a steep rise in unemployment

③<informai: of a price or demand> too much, unreasonable

$5 for a cup of coffee seems a little steep to me.

He wants to move in here with us? That's a bit steep!