めったな => hardly; rarely; seldom N2
Ban
すなわち => in other words; namely ~ N2
めったに~ない => hardly; rarely; seldom N3
めったにない => Rarely N3
Degree. Level, Amount
なくちゃ => must do; need to; gotta do ~ N3
Necessity, obligation
いちがいに…ない => Impossible... in general N2
Description
がちです/がちになる => A tends to become/happen/occur N2
Potential, Possibility
ないと,なくちゃ => Must do A N3
Needs, Requirement
なければならない/なくてはならない/なければいけない/なくてはいけない/なければだめ/なくてはだめ => must N5
~んがため(に)/~んがための      => in order to ~ N1
ないと/なくちゃ/なきゃ => must do; need to; gotta do ~ N3
ちょっと…ない => Honestly, no (softening the tone) N3
Correction